添加json image dowload的配置项

logs/crowdsource-backend.log.2020-10-30.log

@@ -1,113 +0,0 @@
-15:35:52.985 [main] INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$87d25f89] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 
-15:35:53.364 [main] INFO  edu.nju.BugApplication - The following profiles are active: dev 
-15:35:54.991 [main] WARN  o.s.b.actuate.endpoint.EndpointId - Endpoint ID 'nacos-discovery' contains invalid characters, please migrate to a valid format. 
-15:35:55.538 [main] INFO  o.s.d.r.c.RepositoryConfigurationDelegate - Bootstrapping Spring Data repositories in DEFAULT mode. 
-15:35:55.571 [main] INFO  o.s.d.r.c.RepositoryConfigurationDelegate - Finished Spring Data repository scanning in 26ms. Found 0 repository interfaces. 
-15:35:55.727 [main] WARN  o.s.b.actuate.endpoint.EndpointId - Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format. 
-15:35:56.013 [main] INFO  o.s.c.context.scope.GenericScope - BeanFactory id=dd69386d-7336-3446-b1bd-c86a36be6a84 
-15:35:56.254 [main] INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$87d25f89] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 
-15:35:56.998 [main] INFO  o.s.b.w.e.tomcat.TomcatWebServer - Tomcat initialized with port(s): 8080 (http) 
-15:35:57.040 [main] INFO  o.a.catalina.core.StandardService - Starting service [Tomcat] 
-15:35:57.040 [main] INFO  o.a.catalina.core.StandardEngine - Starting Servlet engine: [Apache Tomcat/9.0.17] 
-15:35:57.250 [main] INFO  o.a.c.c.C.[Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext 
-15:35:57.251 [main] INFO  o.s.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 3797 ms 
-15:35:57.946 [main] INFO  org.mongodb.driver.cluster - Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500} 
-15:35:58.133 [cluster-ClusterId{value='5f9bc25d1d830702c595cb18', description='null'}-localhost:27017] INFO  org.mongodb.driver.connection - Opened connection [connectionId{localValue:1, serverValue:1}] to localhost:27017 
-15:35:58.137 [cluster-ClusterId{value='5f9bc25d1d830702c595cb18', description='null'}-localhost:27017] INFO  org.mongodb.driver.cluster - Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[4, 0, 3]}, minWireVersion=0, maxWireVersion=7, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=30, roundTripTimeNanos=2844493} 
-15:35:58.681 [main] INFO  org.mongodb.driver.connection - Opened connection [connectionId{localValue:2, serverValue:2}] to localhost:27017 
-15:35:59.459 [main] WARN  o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'analyzeController': Unsatisfied dependency expressed through field 'blockChainAspect'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'blockChainAspect': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'mooctest.url' in value "${mooctest.url}" 
-15:35:59.461 [main] INFO  org.mongodb.driver.connection - Closed connection [connectionId{localValue:2, serverValue:2}] to localhost:27017 because the pool has been closed. 
-15:35:59.464 [main] INFO  o.a.catalina.core.StandardService - Stopping service [Tomcat] 
-15:35:59.469 [main] WARN  o.a.c.loader.WebappClassLoaderBase - The web application [ROOT] appears to have started a thread named [logback-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
- sun.misc.Unsafe.park(Native Method)
- java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
- java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
- java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
- java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
- java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
- java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
- java.lang.Thread.run(Thread.java:748) 
-15:35:59.469 [main] WARN  o.a.c.loader.WebappClassLoaderBase - The web application [ROOT] appears to have started a thread named [com.alibaba.nacos.naming.client.listener] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
- sun.misc.Unsafe.park(Native Method)
- java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
- java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
- com.alibaba.nacos.client.naming.core.EventDispatcher$Notifier.run(EventDispatcher.java:114)
- java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
- java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
- java.lang.Thread.run(Thread.java:748) 
-15:35:59.470 [main] WARN  o.a.c.loader.WebappClassLoaderBase - The web application [ROOT] appears to have started a thread named [com.alibaba.nacos.naming.failover] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
- sun.misc.Unsafe.park(Native Method)
- java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
- java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
- java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
- java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
- java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
- java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
- java.lang.Thread.run(Thread.java:748) 
-15:35:59.470 [main] WARN  o.a.c.loader.WebappClassLoaderBase - The web application [ROOT] appears to have started a thread named [com.alibaba.nacos.naming.push.receiver] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
- java.net.PlainDatagramSocketImpl.receive0(Native Method)
- java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:143)
- java.net.DatagramSocket.receive(DatagramSocket.java:812)
- com.alibaba.nacos.client.naming.core.PushReceiver.run(PushReceiver.java:73)
- java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
- java.util.concurrent.FutureTask.run(FutureTask.java:266)
- java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
- java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
- java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
- java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
- java.lang.Thread.run(Thread.java:748) 
-15:35:59.481 [main] INFO  o.s.b.a.l.ConditionEvaluationReportLoggingListener - 
-
-Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 
-15:35:59.490 [main] ERROR o.s.boot.SpringApplication - Application run failed 
-org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'analyzeController': Unsatisfied dependency expressed through field 'blockChainAspect'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'blockChainAspect': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'mooctest.url' in value "${mooctest.url}"
-	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
-	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
-	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
-	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
-	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
-	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
-	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
-	at edu.nju.BugApplication.main(BugApplication.java:10)
-Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'blockChainAspect': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'mooctest.url' in value "${mooctest.url}"
-	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:380)
-	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
-	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
-	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
-	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167)
-	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
-	... 19 common frames omitted
-Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'mooctest.url' in value "${mooctest.url}"
-	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172)
-	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124)
-	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237)
-	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211)
-	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175)
-	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:851)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1188)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167)
-	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
-	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
-	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
-	... 30 common frames omitted

logs/crowdsource-backend.log.2021-05-01.log

@@ -1,43576 +0,0 @@
-17:20:02.736 [Curator-TreeCache-0] INFO  o.s.boot.SpringApplication - The following profiles are active: dev 
-17:20:02.751 [Curator-TreeCache-0] INFO  o.s.boot.SpringApplication - Started application in 15.634 seconds (JVM running for 572.815) 
-17:20:02.755 [Curator-Framework-0] INFO  o.a.c.f.imps.CuratorFrameworkImpl - backgroundOperationsLoop exiting 
-17:20:03.934 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:03.982 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:03.982 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:03.983 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:04.673 [Curator-TreeCache-0] INFO  org.apache.zookeeper.ZooKeeper - Session: 0x17559ef9a3fced2 closed 
-17:20:04.674 [Curator-TreeCache-0-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x17559ef9a3fced2 
-17:20:04.722 [Curator-TreeCache-0] INFO  o.s.c.e.event.RefreshEventListener - Refresh keys changed: [spring.data.mongodb.uri] 
-17:20:08.986 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:08.986 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:08.987 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:08.987 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:13.991 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:13.991 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:13.991 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:13.991 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:18.995 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:18.995 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:18.996 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:18.997 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:24.000 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:24.000 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:24.001 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:24.001 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:29.004 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:29.004 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:29.004 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:29.005 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:34.007 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:34.028 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:34.029 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:34.029 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:39.051 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:39.052 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:39.052 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:39.053 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:44.055 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:44.055 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:44.055 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:44.055 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:49.057 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:49.057 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:49.058 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:49.058 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:54.063 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:54.064 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:54.064 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:54.065 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:59.068 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:20:59.069 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:59.070 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:20:59.071 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:04.075 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:04.076 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:04.076 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:04.077 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:09.082 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:09.084 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:09.085 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:09.086 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:14.090 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:14.091 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:14.092 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:14.093 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:19.096 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:19.096 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:19.097 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:19.097 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:24.101 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:24.101 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:24.101 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:24.101 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:29.106 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:29.106 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:29.107 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:29.107 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:34.109 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:34.118 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:34.141 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:34.163 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:39.170 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:39.171 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:39.174 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:39.174 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:44.177 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:44.177 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:44.178 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:44.179 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:49.181 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:49.181 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:49.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:49.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:54.188 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:54.189 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:54.191 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:54.191 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:59.192 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:21:59.193 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:59.194 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:21:59.194 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:04.201 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:04.201 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:04.201 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:04.202 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:09.207 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:09.207 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:09.209 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:09.210 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:14.210 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:14.211 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:14.211 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:14.211 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:19.218 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:19.218 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:19.218 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:19.219 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:24.225 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:24.225 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:24.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:24.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:29.230 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:29.231 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:29.231 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:29.231 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:34.237 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:34.238 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:34.239 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:34.240 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:39.247 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:39.248 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:39.249 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:39.249 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:44.252 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:44.253 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:44.253 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:44.253 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:49.256 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:49.256 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:49.256 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:49.257 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:54.261 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:54.262 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:54.262 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:54.262 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:59.266 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:22:59.266 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:59.266 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:22:59.267 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:04.271 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:04.271 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:04.272 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:04.272 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:09.273 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:09.274 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:09.274 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:09.274 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:14.277 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:14.278 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:14.278 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:14.278 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:19.285 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:19.285 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:19.286 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:19.286 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:24.292 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:24.292 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:24.293 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:24.293 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:29.296 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:29.296 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:29.296 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:29.297 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:34.302 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:34.303 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:34.305 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:34.305 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:39.310 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:39.311 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:39.311 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:39.312 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:44.317 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:44.317 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:44.319 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:44.320 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:49.323 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:49.323 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:49.323 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:49.323 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:54.327 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:54.328 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:54.328 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:54.330 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:59.336 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:23:59.336 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:59.337 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:23:59.337 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:04.339 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:04.339 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:04.341 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:04.341 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:09.343 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:09.345 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:09.346 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:09.346 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:14.351 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:14.351 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:14.351 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:14.352 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:19.354 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:19.354 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:19.354 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:19.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:24.361 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:24.361 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:24.362 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:24.362 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:29.366 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:29.366 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:29.368 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:29.368 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:34.373 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:34.407 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:34.420 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:34.421 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:39.423 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:39.430 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:39.431 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:39.431 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:44.432 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:44.432 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:44.433 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:44.433 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:49.436 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:49.437 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:49.440 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:49.440 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:54.444 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:54.445 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:54.446 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:54.446 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:59.450 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:24:59.450 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:59.450 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:24:59.450 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:04.452 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:04.452 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:04.452 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:04.452 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:09.456 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:09.457 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:09.458 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:09.458 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:14.462 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:14.462 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:14.462 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:14.463 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:19.464 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:19.464 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:19.464 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:19.464 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:24.470 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:24.470 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:24.471 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:24.471 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:29.475 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:29.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:29.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:29.476 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:34.481 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:34.496 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:34.517 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:34.538 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:39.540 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:39.541 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:39.542 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:39.542 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:44.544 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:44.544 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:44.545 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:44.545 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:49.551 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:49.551 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:49.552 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:49.552 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:54.554 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:54.555 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:54.556 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:54.556 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:59.557 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:25:59.557 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:59.557 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:25:59.557 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:04.562 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:04.562 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:04.563 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:04.563 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:09.569 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:09.569 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:09.569 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:09.569 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:14.573 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:14.574 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:14.574 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:14.575 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:19.579 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:19.580 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:19.580 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:19.580 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:24.584 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:24.584 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:24.585 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:24.585 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:29.588 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:29.588 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:29.589 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:29.589 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:34.591 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:34.612 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:34.634 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:34.654 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:39.660 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:39.660 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:39.660 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:39.660 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:44.662 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:44.662 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:44.663 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:44.663 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:49.666 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:49.666 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:49.667 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:49.667 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:54.671 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:54.671 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:54.671 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:54.671 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:59.677 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:26:59.678 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:59.678 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:26:59.678 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:04.681 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:04.681 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:04.682 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:04.682 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:09.688 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:09.689 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:09.690 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:09.691 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:14.697 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:14.697 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:14.698 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:14.699 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:19.701 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:19.701 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:19.702 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:19.702 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:24.703 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:24.703 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:24.704 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:24.704 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:29.705 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:29.706 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:29.706 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:29.706 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:34.713 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:34.728 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:34.750 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:34.751 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:39.757 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:39.758 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:39.759 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:39.759 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:44.764 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:44.764 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:44.764 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:44.765 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:49.766 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:49.767 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:49.768 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:49.768 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:54.773 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:54.773 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:54.776 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:54.776 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:59.778 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:27:59.778 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:59.779 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:27:59.779 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:04.784 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:04.785 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:04.785 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:04.785 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:09.791 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:09.791 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:09.791 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:09.792 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:14.797 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:14.797 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:14.798 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:14.798 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:19.803 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:19.806 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:19.807 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:19.807 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:24.811 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:24.811 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:24.811 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:24.811 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:29.817 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:29.817 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:29.817 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:29.817 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:34.823 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:34.824 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:34.825 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:34.825 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:39.826 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:39.827 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:39.827 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:39.827 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:44.835 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:44.835 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:44.836 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:44.836 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:49.838 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:49.839 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:49.839 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:49.839 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:54.842 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:54.843 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:54.844 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:54.844 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:59.851 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:28:59.851 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:59.853 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:28:59.853 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:04.855 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:04.856 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:04.856 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:04.856 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:09.858 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:09.858 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:09.859 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:09.859 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:14.862 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:14.862 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:14.862 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:14.863 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:19.865 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:19.866 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:19.866 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:19.867 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:24.873 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:24.873 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:24.873 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:24.874 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:29.879 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:29.879 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:29.880 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:29.880 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:34.885 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:34.886 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:34.886 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:34.886 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:39.889 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:39.890 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:39.890 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:39.891 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:44.897 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:44.897 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:44.898 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:44.898 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:49.904 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:49.904 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:49.905 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:49.905 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:54.908 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:54.909 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:54.909 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:54.910 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:59.916 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:29:59.917 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:59.918 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:29:59.918 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:04.923 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:04.923 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:04.923 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:04.924 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:09.930 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:09.930 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:09.931 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:09.931 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:14.937 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:14.937 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:14.938 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:14.938 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:19.943 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:19.943 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:19.943 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:19.944 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:24.945 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:24.946 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:24.946 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:24.946 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:29.948 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:29.948 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:29.948 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:29.949 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:34.955 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:34.965 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:34.986 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:34.986 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:39.992 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:39.992 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:39.995 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:39.995 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:45.000 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:45.000 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:45.000 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:45.000 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:50.003 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:50.003 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:50.005 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:50.005 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:55.008 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:30:55.008 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:55.010 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:30:55.011 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:00.014 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:00.014 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:00.015 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:00.015 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:05.021 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:05.022 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:05.024 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:05.024 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:10.029 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:10.030 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:10.031 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:10.031 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:15.034 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:15.034 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:15.034 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:15.034 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:20.040 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:20.040 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:20.041 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:20.041 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:25.047 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:25.047 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:25.048 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:25.050 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:30.056 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:30.057 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:30.058 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:30.060 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:35.062 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:35.083 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:35.104 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:35.124 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:40.130 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:40.131 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:40.132 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:40.133 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:45.140 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:45.141 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:45.141 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:45.141 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:50.143 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:50.143 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:50.144 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:50.146 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:55.149 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:31:55.150 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:55.150 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:31:55.152 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:00.157 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:00.157 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:00.157 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:00.158 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:05.164 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:05.164 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:05.164 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:05.165 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:10.173 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:10.174 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:10.174 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:10.174 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:15.179 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:15.180 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:15.180 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:15.180 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:20.182 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:20.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:20.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:20.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:25.190 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:25.190 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:25.191 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:25.192 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:30.197 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:30.197 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:30.197 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:30.198 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:35.200 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:35.201 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:35.201 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:35.202 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:40.207 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:40.207 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:40.207 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:40.208 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:45.211 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:45.211 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:45.211 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:45.211 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:50.218 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:50.218 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:50.219 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:50.219 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:55.224 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:32:55.224 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:55.224 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:32:55.225 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:00.228 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:00.228 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:00.228 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:00.228 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:05.233 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:05.234 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:05.235 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:05.235 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:10.237 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:10.237 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:10.238 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:10.238 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:15.239 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:15.240 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:15.240 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:15.240 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:20.243 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:20.243 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:20.243 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:20.243 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:25.250 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:25.250 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:25.251 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:25.252 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:30.263 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:30.263 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:30.263 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:30.263 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:35.268 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:35.268 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:35.268 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:35.268 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:40.273 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:40.273 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:40.274 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:40.274 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:45.336 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:45.336 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:45.337 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:45.338 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:50.344 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:50.344 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:50.346 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:50.346 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:55.354 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:33:55.354 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:55.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:33:55.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:00.360 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:00.360 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:00.361 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:00.361 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:27.296 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:27.296 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:27.296 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:27.296 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:32.300 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:32.300 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:32.300 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:32.300 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:37.305 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:37.305 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:37.306 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:37.306 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:42.313 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:42.313 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:42.314 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:42.314 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:47.318 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:47.319 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:47.319 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:47.319 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:52.322 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:52.322 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:52.323 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:52.323 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:57.326 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:34:57.327 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:57.328 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:34:57.328 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:02.333 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:02.335 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:02.335 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:02.336 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:07.338 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:07.338 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:07.339 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:07.340 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:12.345 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:12.345 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:12.345 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:12.345 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:17.347 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:17.347 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:17.348 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:17.349 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:22.353 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:22.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:22.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:22.356 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:27.361 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:27.361 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:27.361 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:27.361 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:32.365 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:32.366 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:32.367 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:32.367 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:37.370 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:37.370 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:37.371 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:37.372 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:42.378 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:42.379 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:42.380 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:42.381 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:47.385 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:47.385 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:47.385 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:47.385 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:52.389 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:52.389 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:52.389 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:52.390 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:57.391 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:35:57.391 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:57.391 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:35:57.391 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:02.397 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:02.397 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:02.398 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:02.398 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:07.401 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:07.401 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:07.403 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:07.403 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:12.407 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:12.407 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:12.408 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:12.408 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:17.409 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:17.409 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:17.409 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:17.409 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:22.414 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:22.414 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:22.414 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:22.415 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:27.420 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:27.421 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:27.421 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:27.421 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:32.425 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:32.425 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:32.425 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:32.426 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:37.428 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:37.429 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:37.430 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:37.430 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:42.431 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:42.431 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:42.431 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:42.431 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:47.437 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:47.437 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:47.438 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:47.438 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:52.440 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:52.449 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:52.450 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:52.450 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:57.451 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:36:57.453 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:57.453 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:36:57.453 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:02.459 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:02.459 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:02.460 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:02.460 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:07.466 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:07.467 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:07.467 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:07.469 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:12.472 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:12.472 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:12.472 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:12.473 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:17.474 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:17.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:17.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:17.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:22.481 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:22.481 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:22.481 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:22.483 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:27.484 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:27.484 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:27.485 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:27.485 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:32.489 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:32.489 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:32.490 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:32.491 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:37.498 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:37.499 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:37.499 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:37.499 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:42.501 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:42.503 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:42.504 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:42.505 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:47.507 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:47.507 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:47.508 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:47.508 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:52.510 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:52.511 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:52.512 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:52.513 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:57.516 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:37:57.520 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:57.520 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:37:57.520 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:02.526 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:02.526 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:02.526 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:02.526 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:07.532 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:07.532 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:07.532 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:07.532 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:12.537 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:12.538 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:12.538 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:12.538 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:17.542 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:17.542 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:17.542 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:17.542 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:22.544 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:22.544 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:22.545 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:22.545 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:27.551 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:27.551 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:27.551 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:27.551 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:32.552 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:32.553 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:32.554 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:32.554 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:37.561 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:37.561 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:37.561 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:37.561 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:42.566 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:42.566 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:42.567 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:42.567 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:47.571 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:47.571 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:47.574 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:47.574 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:52.580 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:52.580 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:52.582 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:52.582 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:57.589 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:38:57.590 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:57.591 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:38:57.591 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:02.594 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:02.594 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:02.594 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:02.596 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:07.601 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:07.601 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:07.601 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:07.602 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:12.605 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:12.605 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:12.606 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:12.606 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:17.610 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:17.610 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:17.611 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:17.612 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:22.619 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:22.619 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:22.619 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:22.620 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:27.627 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:27.628 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:27.629 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:27.630 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:32.638 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:32.638 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:32.639 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:32.639 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:37.646 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:37.646 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:37.646 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:37.646 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:42.652 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:42.652 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:42.652 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:42.653 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:47.654 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:47.654 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:47.655 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:47.655 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:52.662 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:52.663 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:52.663 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:52.663 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:57.669 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:39:57.670 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:57.670 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:39:57.670 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:02.677 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:02.679 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:02.680 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:02.681 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:07.684 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:07.684 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:07.684 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:07.684 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:12.690 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:12.690 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:12.690 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:12.691 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:17.694 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:17.694 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:17.695 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:17.695 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:22.701 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:22.701 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:22.702 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:22.702 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:27.705 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:27.705 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:27.706 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:27.706 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:32.708 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:32.708 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:32.709 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:32.709 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:37.716 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:37.716 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:37.719 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:37.719 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:42.724 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:42.724 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:42.724 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:42.724 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:47.731 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:47.732 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:47.732 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:47.732 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:52.735 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:52.735 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:52.735 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:52.736 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:57.737 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:40:57.739 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:57.740 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:40:57.740 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:02.743 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:02.744 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:02.744 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:02.744 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:07.749 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:07.749 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:07.750 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:07.751 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:12.118 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard from server in 26672ms for sessionid 0x17559ef9a3fced0 
-17:41:12.119 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard from server in 26672ms for sessionid 0x17559ef9a3fced0, closing socket connection and attempting reconnect 
-17:41:12.223 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: SUSPENDED 
-17:41:12.754 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:12.754 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:12.755 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:12.755 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:14.005 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:14.005 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:14.006 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:15.682 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:15.682 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:15.683 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:17.321 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:17.322 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:17.322 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:17.756 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:17.757 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:17.757 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:17.757 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:18.993 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:18.994 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:18.994 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:20.185 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:20.185 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:20.185 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:21.834 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:21.834 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:21.835 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:22.761 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:22.761 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:22.762 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:22.762 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:23.801 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:23.801 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:23.801 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:25.197 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:25.197 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:25.197 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:26.924 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:26.925 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:26.925 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:27.766 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:27.766 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:27.766 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:27.766 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:28.090 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:28.091 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:28.091 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:29.207 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:29.207 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:29.207 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:30.559 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:30.559 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:30.559 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:32.160 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:32.163 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:32.163 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:32.770 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:32.770 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:32.770 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:32.770 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:34.216 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:34.217 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:34.217 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:36.058 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:36.058 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:36.058 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:37.772 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:37.773 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:37.773 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:37.773 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:37.892 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:37.892 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:37.892 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:39.991 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:39.991 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:39.991 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:41.138 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:41.140 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:41.140 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:42.521 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:42.522 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:42.522 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:42.778 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:42.778 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:42.779 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:42.779 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:43.943 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:43.944 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:43.944 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:45.158 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:45.158 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:45.158 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:46.876 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:46.876 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:46.877 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:47.785 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:47.785 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:47.786 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:47.786 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:48.350 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:48.351 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:48.351 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:49.474 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:49.475 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:49.475 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:50.776 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:50.777 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:50.777 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.115 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.116 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.116 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.225 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40001. Adjusted session timeout ms: 40000 
-17:41:52.225 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.226 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40003. Adjusted session timeout ms: 40000 
-17:41:52.226 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.226 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.226 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40003. Adjusted session timeout ms: 40000 
-17:41:52.226 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.227 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.228 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.228 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.228 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40005. Adjusted session timeout ms: 40000 
-17:41:52.228 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.228 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.228 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.228 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40005. Adjusted session timeout ms: 40000 
-17:41:52.228 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.228 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.228 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.229 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.229 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.229 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.229 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.229 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.229 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40006. Adjusted session timeout ms: 40000 
-17:41:52.230 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.230 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.230 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.230 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40007. Adjusted session timeout ms: 40000 
-17:41:52.230 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.230 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40007. Adjusted session timeout ms: 40000 
-17:41:52.230 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.230 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40007. Adjusted session timeout ms: 40000 
-17:41:52.230 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.230 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40007. Adjusted session timeout ms: 40000 
-17:41:52.230 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.230 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40007. Adjusted session timeout ms: 40000 
-17:41:52.230 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.230 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40007. Adjusted session timeout ms: 40000 
-17:41:52.231 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.231 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40008. Adjusted session timeout ms: 40000 
-17:41:52.231 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.231 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40008. Adjusted session timeout ms: 40000 
-17:41:52.231 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.231 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.231 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.231 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40008. Adjusted session timeout ms: 40000 
-17:41:52.231 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.231 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.231 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.231 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.231 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.231 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.231 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40008. Adjusted session timeout ms: 40000 
-17:41:52.231 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.232 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.232 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.232 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.233 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.233 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.232 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40009. Adjusted session timeout ms: 40000 
-17:41:52.233 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.233 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.233 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.233 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.233 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.233 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.234 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-17:41:52.234 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: LOST 
-17:41:52.234 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-17:41:52.234 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-17:41:52.234 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x17559ef9a3fced0 
-17:41:52.235 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-17:41:52.235 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.234 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-17:41:52.235 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-17:41:52.234 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-17:41:52.235 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.235 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-17:41:52.235 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.235 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-17:41:52.236 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-17:41:52.236 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:52.237 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:52.237 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:52.789 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:52.789 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:52.791 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:52.791 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:53.344 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:53.344 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:53.344 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:53.657 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:53.657 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:53.657 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:54.452 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:54.453 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:54.453 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:54.827 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:54.827 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:54.828 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:55.561 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:55.561 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:55.561 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:56.055 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:56.056 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:56.056 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:56.667 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:56.667 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:56.667 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:57.587 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:57.588 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:57.588 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:57.772 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:57.785 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:57.785 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:57.797 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:41:57.797 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:57.799 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:57.799 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:41:58.889 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:58.889 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:58.890 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:59.291 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:59.291 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:59.291 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:41:59.996 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:41:59.996 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:41:59.997 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:00.551 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:00.551 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:00.551 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:01.104 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:01.117 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:01.117 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:02.160 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:02.160 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:02.161 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:02.222 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:02.223 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:02.223 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:02.802 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:02.802 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:02.802 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:02.802 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:03.326 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:03.326 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:03.326 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:03.387 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:03.389 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:03.389 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:04.433 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:04.434 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:04.434 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:04.620 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:04.620 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:04.620 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:05.542 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:05.543 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:05.543 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:06.025 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:06.026 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:06.026 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:06.648 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:06.649 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:06.649 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:07.684 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:07.684 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:07.684 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:07.757 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:07.757 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:07.757 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:07.804 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:07.804 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:07.806 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:07.807 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:08.867 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:08.867 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:08.868 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:09.284 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:09.284 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:09.285 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:09.974 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:09.974 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:09.975 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:10.554 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:10.554 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:10.555 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:11.084 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:11.084 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:11.084 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:12.194 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:12.194 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:12.195 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:12.597 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:12.597 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:12.597 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:12.814 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:12.814 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:12.814 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:12.814 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:13.303 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:13.304 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:13.304 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:14.100 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:14.101 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:14.101 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:14.409 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:14.410 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:14.410 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:15.517 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:15.517 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:15.517 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:16.113 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:16.113 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:16.113 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:16.620 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:16.620 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:16.620 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:17.440 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:17.440 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:17.440 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:17.726 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:17.749 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:17.770 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:17.816 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:17.816 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:17.817 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:17.817 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:18.621 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:18.622 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:18.622 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:18.872 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:18.872 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:18.873 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:19.889 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:19.891 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:19.891 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:19.979 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:19.979 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:19.979 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:21.086 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:21.086 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:21.086 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:21.479 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:21.479 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:21.480 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:22.192 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:22.193 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:22.193 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:22.702 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:22.703 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:22.703 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:22.818 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:22.820 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:22.820 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:22.820 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:23.298 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:23.302 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:23.302 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:24.030 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:24.030 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:24.030 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:24.407 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:24.408 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:24.408 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:25.365 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:25.366 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:25.366 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:25.520 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:25.521 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:25.521 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:26.475 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:26.475 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:26.475 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:26.626 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:26.627 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:26.627 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:27.734 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:27.735 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:27.735 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:27.823 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:27.824 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:27.824 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:27.824 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:27.887 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:27.888 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:27.888 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:28.842 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:28.843 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:28.843 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:29.843 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:29.844 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:29.844 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:29.948 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:29.949 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:29.949 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:31.054 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:31.055 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:31.055 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:31.360 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:31.361 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:31.362 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:32.160 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:32.161 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:32.161 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:32.832 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:32.832 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:32.833 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:32.834 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:33.271 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:33.272 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:33.272 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:33.372 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:33.373 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:33.373 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:34.378 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:34.379 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:34.379 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:34.796 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:34.796 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:34.796 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:35.487 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:35.487 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:35.487 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:36.596 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:36.596 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:36.596 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:36.711 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:36.711 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:36.711 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:37.705 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:37.705 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:37.705 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:37.839 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:37.839 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:37.839 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:37.839 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:38.579 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:38.579 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:38.579 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:38.815 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:38.815 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:38.815 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:39.923 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:39.923 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:39.923 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:40.032 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:40.032 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:40.032 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:41.031 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:41.032 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:41.032 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:41.659 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:41.660 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:41.660 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:42.142 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:42.142 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:42.143 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:42.846 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:42.846 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:42.847 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:42.848 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:42.900 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:42.900 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:42.901 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:43.250 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:43.251 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:43.251 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:44.358 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:44.359 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:44.359 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:44.417 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:44.418 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:44.418 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:45.467 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:45.468 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:45.468 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:46.085 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:46.086 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:46.086 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:46.575 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:46.576 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:46.576 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:47.680 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:47.681 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:47.681 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:47.691 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:47.691 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:47.692 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:47.854 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:47.854 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:47.855 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:47.855 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:48.786 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:48.787 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:48.787 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:49.235 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:49.236 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:49.236 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:49.895 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:49.895 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:49.895 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:51.002 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:51.003 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:51.003 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:51.013 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:51.014 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:51.014 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:52.109 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:52.109 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:52.109 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:52.548 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:52.548 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:52.548 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:52.857 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:52.857 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:52.857 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:52.857 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:53.221 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:53.222 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:53.222 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:54.324 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:54.324 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:54.325 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:54.486 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:54.487 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:54.487 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:55.435 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:55.435 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:55.436 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:56.433 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:56.433 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:56.433 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:56.539 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:56.539 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:56.539 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:57.642 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:57.643 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:57.643 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:57.807 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:57.808 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:57.808 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:57.861 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:42:57.861 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:57.862 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:57.862 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:42:58.749 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:58.750 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:58.750 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:59.058 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:59.059 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:59.059 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:42:59.856 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:42:59.856 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:42:59.856 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:00.208 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:00.208 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:00.209 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:00.962 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:00.963 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:00.963 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:02.069 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:02.070 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:02.070 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:02.070 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:02.071 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:02.071 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:02.868 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:02.868 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:02.869 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:02.870 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:03.179 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:03.179 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:03.179 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:03.351 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:03.352 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:03.352 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:04.283 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:04.287 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:04.287 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:04.870 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:04.871 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:04.871 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:05.393 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:05.394 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:05.394 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:06.502 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:06.502 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:06.503 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:06.545 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:06.545 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:06.545 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:07.604 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:07.604 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:07.604 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:07.876 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:07.876 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:07.877 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:07.877 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:08.629 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:08.630 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:08.630 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:08.713 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:08.713 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:08.713 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:09.820 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:09.820 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:09.820 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:10.041 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:10.042 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:10.042 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:10.928 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:10.928 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:10.928 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:11.952 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:11.952 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:11.952 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:12.029 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:12.029 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:12.029 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:12.883 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:12.883 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:12.883 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:12.884 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:13.133 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:13.133 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:13.133 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:13.885 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:13.886 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:13.886 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:14.241 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:14.242 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:14.242 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:15.236 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:15.236 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:15.236 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:15.348 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:15.349 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:15.349 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:16.458 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:16.459 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:16.459 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:17.182 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:17.182 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:17.182 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:17.565 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:17.565 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:17.566 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:17.887 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:17.887 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:17.888 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:17.888 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:18.668 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:18.668 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:18.668 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:18.901 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:18.901 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:18.901 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:19.778 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:19.779 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:19.779 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:20.887 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:20.887 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:20.887 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:20.887 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:20.888 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:20.888 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:21.998 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:21.999 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:21.999 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:22.744 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:22.745 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:22.745 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:22.894 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:22.895 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:22.896 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:22.896 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:23.103 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:23.104 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:23.105 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:23.919 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:23.919 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:23.919 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:24.216 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:24.216 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:24.216 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:25.324 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:25.324 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:25.324 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:26.020 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:26.020 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:26.020 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:26.435 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:26.435 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:26.435 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:27.152 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:27.157 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:27.158 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:27.545 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:27.545 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:27.545 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:27.900 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:27.902 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:27.902 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:27.902 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:28.656 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:28.656 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:28.656 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:28.864 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:28.865 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:28.865 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:29.767 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:29.767 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:29.767 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:30.308 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:30.309 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:30.309 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:30.876 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:30.876 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:30.876 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:31.606 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:31.607 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:31.607 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:31.982 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:31.982 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:31.982 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:32.905 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:32.905 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:32.906 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:32.906 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:33.091 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:33.101 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:33.101 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:33.535 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:33.536 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:33.536 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:34.208 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:34.209 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:34.209 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:35.208 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:35.209 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:35.209 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:35.316 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:35.316 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:35.316 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:36.425 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:36.425 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:36.425 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:37.191 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:37.192 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:37.192 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:37.532 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:37.533 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:37.533 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:37.910 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:37.911 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:37.911 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:37.911 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:38.642 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:38.642 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:38.642 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:38.895 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:38.896 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:38.896 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:39.744 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:39.744 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:39.744 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:40.730 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:40.731 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:40.731 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:40.852 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:40.852 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:40.852 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:41.889 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:41.889 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:41.890 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:41.961 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:41.962 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:41.962 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:42.919 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:42.919 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:42.919 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:42.920 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:43.056 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:43.057 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:43.057 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:43.069 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:43.070 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:43.072 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:44.180 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:44.180 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:44.180 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:44.861 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:44.861 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:44.861 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:45.286 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:45.287 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:45.287 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:46.393 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:46.394 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:46.394 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:46.717 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:46.718 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:46.718 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:47.497 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:47.497 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:47.497 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:47.907 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:47.907 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:47.908 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:47.926 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:47.926 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:47.926 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:47.927 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:48.608 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:48.608 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:48.608 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:49.656 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:49.656 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:49.657 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:49.716 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:49.716 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:49.716 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:50.822 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:50.823 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:50.823 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:51.061 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:51.061 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:51.062 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:51.930 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:51.931 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:51.931 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:52.849 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:52.850 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:52.850 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:52.931 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:52.931 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:52.932 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:52.933 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:53.035 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:53.036 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:53.036 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:54.146 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:54.147 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:54.147 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:54.435 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:54.435 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:54.435 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:55.251 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:55.251 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:55.251 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:56.350 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:56.350 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:56.350 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:56.357 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:56.357 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:56.357 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:57.465 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:57.466 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:57.466 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:57.866 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:57.868 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:57.868 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:57.938 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:43:57.938 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:57.939 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:57.939 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:43:58.570 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:58.571 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:58.571 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:59.145 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:59.145 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:59.145 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:43:59.676 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:43:59.676 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:43:59.678 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:00.778 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:00.778 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:00.779 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:00.781 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:00.781 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:00.781 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:01.890 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:01.892 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:01.892 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:02.060 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:02.060 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:02.060 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:02.941 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:02.941 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:02.942 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:02.942 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:02.999 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:02.999 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:02.999 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:03.312 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:03.313 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:03.313 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:04.106 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:04.107 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:04.107 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:05.217 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:05.218 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:05.218 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:05.394 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:05.394 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:05.394 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:06.327 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:06.328 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:06.328 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:06.951 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:06.951 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:06.952 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:07.435 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:07.435 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:07.435 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:07.946 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:07.947 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:07.947 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:07.947 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:08.540 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:08.540 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:08.540 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:08.885 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:08.885 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:08.885 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:09.643 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:09.643 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:09.643 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:10.049 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:10.050 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:10.050 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:10.759 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:10.760 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:10.760 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:11.836 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:11.836 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:11.837 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:11.871 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:11.872 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:11.872 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:12.949 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:12.949 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:12.950 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:12.950 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:12.983 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:12.984 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:12.984 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:13.188 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:13.189 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:13.189 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:14.095 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:14.096 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:14.096 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:14.357 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:14.357 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:14.357 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:15.207 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:15.208 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:15.208 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:15.767 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:15.767 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:15.768 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:16.320 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:16.320 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:16.320 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:17.438 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:17.439 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:17.439 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:17.485 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:17.486 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:17.486 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:17.958 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:17.958 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:17.960 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:17.960 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:18.548 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:18.549 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:18.549 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:19.249 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:19.250 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:19.250 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:19.657 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:19.657 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:19.657 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:20.435 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:20.435 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:20.436 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:20.771 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:20.772 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:20.772 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:21.882 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:21.883 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:21.883 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:22.489 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:22.490 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:22.490 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:22.971 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:22.971 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:22.971 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:22.971 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:22.989 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:22.989 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:22.989 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:23.791 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:23.791 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:23.791 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:24.100 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:24.100 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:24.100 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:25.205 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:25.206 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:25.206 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:25.599 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:25.599 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:25.599 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:26.317 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:26.317 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:26.317 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:27.105 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:27.106 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:27.106 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:27.424 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:27.425 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:27.425 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:27.972 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:27.973 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:27.973 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:27.973 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:28.537 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:28.537 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:28.537 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:28.773 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:28.774 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:28.774 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:29.647 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:29.648 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:29.648 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:30.370 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:30.371 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:30.371 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:30.759 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:30.759 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:30.760 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:31.870 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:31.872 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:31.872 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:32.199 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:32.199 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:32.199 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:32.982 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:32.983 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:32.983 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:32.983 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:32.983 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:32.984 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:32.984 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:34.089 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:34.090 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:34.090 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:34.132 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:34.132 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:34.132 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:35.193 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:35.194 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:35.194 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:35.505 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:35.506 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:35.506 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:36.307 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:36.307 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:36.308 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:37.169 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:37.169 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:37.170 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:37.424 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:37.424 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:37.424 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:37.992 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:37.992 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:37.992 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:37.992 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:38.544 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:38.544 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:38.544 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:38.759 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:38.760 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:38.760 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:39.660 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:39.661 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:39.661 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:40.694 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:40.694 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:40.694 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:40.777 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:40.777 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:40.778 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:41.889 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:41.889 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:41.890 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:42.361 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:42.362 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:42.362 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:42.998 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:42.999 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:42.999 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:42.999 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:42.999 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:43.001 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:43.002 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:43.533 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:43.534 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:43.534 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:44.109 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:44.110 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:44.110 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:44.747 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:44.748 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:44.748 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:45.220 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:45.220 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:45.221 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:46.329 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:46.329 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:46.329 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:46.516 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:46.517 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:46.517 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:47.438 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:47.438 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:47.438 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:48.010 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:48.010 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:48.010 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:48.011 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:48.211 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:48.211 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:48.211 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:48.555 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:48.556 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:48.556 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:49.670 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:49.670 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:49.671 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:50.122 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:50.122 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:50.122 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:50.781 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:50.782 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:50.782 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:51.890 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:51.891 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:51.891 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:52.172 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:52.172 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:52.172 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:53.004 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:53.004 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:53.004 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:53.017 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:53.017 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:53.018 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:53.018 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:54.110 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:54.111 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:54.111 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:54.194 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:54.195 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:54.195 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:55.226 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:55.227 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:55.227 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:55.918 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:55.918 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:55.918 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:56.337 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:56.338 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:56.338 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:57.294 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:57.294 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:57.294 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:57.454 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:57.454 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:57.454 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:58.026 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:44:58.027 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:58.027 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:58.027 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:44:58.568 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:58.568 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:58.568 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:58.941 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:58.941 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:58.941 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:44:59.676 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:44:59.677 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:44:59.677 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:00.601 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:00.601 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:00.601 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:00.789 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:00.790 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:00.790 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:01.904 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:01.905 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:01.905 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:02.105 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:02.106 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:02.106 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:03.016 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:03.016 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:03.017 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:03.039 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:03.039 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:03.041 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:03.042 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:04.067 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:04.068 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:04.068 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:04.132 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:04.133 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:04.133 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:05.250 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:05.251 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:05.251 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:06.080 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:06.080 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:06.080 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:06.368 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:06.369 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:06.369 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:07.484 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:07.485 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:07.485 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:07.891 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:07.891 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:07.891 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:08.048 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:08.049 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:08.049 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:08.049 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:08.593 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:08.593 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:08.593 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:09.703 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:09.703 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:09.703 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:09.916 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:09.917 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:09.917 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:10.814 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:10.814 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:10.814 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:11.686 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:11.686 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:11.687 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:11.923 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:11.924 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:11.924 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:13.043 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:13.043 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:13.046 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:13.055 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:13.056 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:13.057 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:13.058 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:13.565 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:13.565 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:13.565 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:14.160 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:14.160 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:14.160 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:15.255 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:15.256 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:15.256 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:15.273 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:15.273 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:15.273 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:16.384 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:16.384 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:16.384 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:17.002 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:17.002 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:17.002 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:17.498 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:17.498 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:17.498 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:18.064 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:18.064 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:18.066 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:18.067 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:18.232 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:18.232 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:18.232 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:18.613 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:18.614 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:18.614 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:19.730 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:19.730 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:19.731 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:20.067 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:20.068 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:20.068 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:20.845 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:20.846 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:20.846 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:21.938 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:21.938 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:21.938 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:21.951 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:21.952 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:21.952 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:23.066 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:23.067 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:23.067 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:23.078 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:23.078 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:23.080 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:23.080 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:23.428 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:23.428 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:23.429 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:24.178 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:24.178 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:24.178 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:25.271 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:25.271 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:25.271 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:25.296 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:25.296 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:25.296 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:26.409 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:26.409 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:26.409 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:26.862 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:26.863 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:26.863 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:27.520 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:27.520 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:27.520 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:28.088 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:28.088 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:28.089 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:28.089 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:28.629 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:28.629 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:28.629 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:28.934 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:28.934 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:28.935 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:29.741 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:29.741 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:29.741 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:30.179 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:30.180 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:30.180 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:30.857 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:30.857 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:30.857 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:31.719 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:31.721 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:31.721 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:31.974 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:31.974 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:31.974 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:33.091 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:33.091 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:33.091 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:33.092 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:33.092 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:33.092 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:33.091 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:33.217 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:33.218 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:33.218 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:34.203 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:34.204 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:34.204 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:35.030 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:35.031 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:35.031 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:35.318 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:35.318 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:35.318 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:36.435 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:36.436 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:36.436 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:36.635 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:36.636 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:36.636 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:37.552 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:37.553 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:37.553 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:37.878 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:37.878 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:37.878 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:38.102 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:38.102 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:38.103 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:38.103 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:38.669 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:38.669 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:38.669 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:39.651 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:39.651 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:39.651 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:39.781 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:39.781 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:39.781 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:40.897 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:40.898 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:40.898 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:41.724 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:41.725 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:41.725 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:42.005 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:42.005 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:42.005 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:42.913 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:42.913 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:42.913 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:43.108 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:43.109 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:43.109 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:43.109 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:43.124 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:43.124 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:43.125 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:44.106 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:44.107 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:44.107 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:44.237 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:44.237 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:44.238 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:45.351 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:45.351 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:45.351 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:46.045 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:46.047 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:46.047 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:46.467 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:46.468 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:46.468 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:47.466 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:47.466 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:47.467 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:47.583 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:47.583 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:47.583 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:48.118 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:48.118 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:48.119 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:48.119 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:48.624 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:48.624 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:48.624 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:48.694 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:48.694 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:48.695 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:49.806 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:49.806 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:49.807 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:49.925 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:49.926 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:49.926 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:50.918 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:50.919 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:50.919 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:51.904 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:51.904 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:51.904 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:52.023 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:52.023 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:52.023 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:53.121 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:53.122 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:53.122 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:53.122 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:53.137 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:53.137 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:53.137 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:53.144 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:53.145 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:53.145 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:54.248 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:54.249 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:54.249 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:54.972 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:54.972 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:54.972 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:55.365 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:55.366 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:55.366 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:56.330 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:56.331 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:56.331 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:56.476 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:56.477 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:56.477 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:57.492 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:57.492 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:57.492 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:57.586 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:57.587 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:57.587 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:58.134 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:45:58.134 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:58.134 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:58.134 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:45:58.694 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:58.694 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:58.695 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:59.237 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:59.237 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:59.237 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:45:59.807 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:45:59.808 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:45:59.808 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:00.925 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:00.925 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:00.925 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:01.168 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:01.168 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:01.168 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:02.044 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:02.045 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:02.046 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:03.008 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:03.008 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:03.008 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:03.142 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:03.142 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:03.143 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:03.143 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:03.154 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:03.154 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:03.154 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:04.272 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:04.273 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:04.273 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:05.071 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:05.072 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:05.072 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:05.385 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:05.386 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:05.386 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:06.495 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:06.495 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:06.495 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:06.648 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:06.648 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:06.649 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:07.608 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:07.609 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:07.609 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:08.136 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:08.136 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:08.136 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:08.153 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:08.153 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:08.153 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:08.154 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:08.720 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:08.720 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:08.720 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:09.837 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:09.837 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:09.837 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:09.889 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:09.889 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:09.890 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:10.958 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:10.958 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:10.959 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:11.065 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:11.065 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:11.065 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:12.072 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:12.072 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:12.073 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:12.381 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:12.382 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:12.382 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:13.164 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:13.164 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:13.164 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:13.164 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:13.181 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:13.182 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:13.182 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:13.750 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:13.750 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:13.750 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:14.292 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:14.292 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:14.293 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:14.868 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:14.868 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:14.869 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:15.411 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:15.412 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:15.412 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:16.518 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:16.519 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:16.519 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:16.904 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:16.904 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:16.905 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:17.625 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:17.626 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:17.626 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:18.168 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:18.168 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:18.168 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:18.168 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:18.743 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:18.743 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:18.743 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:18.923 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:18.924 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:18.924 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:19.854 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:19.854 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:19.855 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:20.479 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:20.479 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:20.479 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:20.971 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:20.971 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:20.971 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:22.091 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:22.091 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:22.091 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:22.457 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:22.457 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:22.457 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:23.170 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:23.170 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:23.170 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:23.171 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:23.203 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:23.204 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:23.204 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:23.874 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:23.874 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:23.875 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:24.310 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:24.311 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:24.311 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:25.389 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:25.389 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:25.390 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:25.424 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:25.424 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:25.425 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:26.542 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:26.543 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:26.543 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:26.701 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:26.701 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:26.701 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:27.663 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:27.664 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:27.664 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:28.182 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:28.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:28.183 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:28.183 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:28.643 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:28.643 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:28.644 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:28.777 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:28.777 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:28.778 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:29.828 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:29.829 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:29.829 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:29.883 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:29.883 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:29.884 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:31.004 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:31.005 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:31.005 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:31.609 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:31.611 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:31.611 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:32.123 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:32.123 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:32.123 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:33.186 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:33.186 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:33.187 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:33.187 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:33.233 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:33.233 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:33.233 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:33.480 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:33.481 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:33.481 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:34.346 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:34.346 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:34.346 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:35.454 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:35.455 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:35.455 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:35.463 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:35.463 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:35.463 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:36.569 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:36.569 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:36.569 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:37.224 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:37.225 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:37.225 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:37.678 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:37.678 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:37.678 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:38.213 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:38.214 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:38.214 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:38.214 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:38.786 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:38.786 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:38.786 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:39.267 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:39.267 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:39.267 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:39.901 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:39.901 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:39.902 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:41.005 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:41.005 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:41.006 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:41.013 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:41.013 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:41.014 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:42.132 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:42.132 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:42.132 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:42.801 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:42.801 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:42.801 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:43.226 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:43.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:43.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:43.228 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:43.247 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:43.247 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:43.247 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:44.193 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:44.194 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:44.194 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:44.358 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:44.358 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:44.358 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:45.471 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:45.472 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:45.472 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:46.029 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:46.029 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:46.029 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:46.588 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:46.588 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:46.588 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:47.694 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:47.695 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:47.695 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:48.081 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:48.081 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:48.082 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:48.239 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:48.239 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:48.239 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:48.241 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:48.814 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:48.814 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:48.814 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:49.229 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:49.229 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:49.229 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:49.926 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:49.926 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:49.927 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:51.017 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:51.017 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:51.017 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:51.039 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:51.039 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:51.039 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:52.159 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:52.160 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:52.160 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:53.106 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:53.107 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:53.107 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:53.254 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:53.254 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:53.255 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:53.256 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:53.281 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:53.282 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:53.282 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:54.392 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:54.393 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:54.393 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:54.909 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:54.909 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:54.909 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:55.509 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:55.509 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:55.510 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:56.476 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:56.476 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:56.476 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:56.626 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:56.626 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:56.626 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:57.739 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:57.739 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:57.739 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:57.903 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:57.904 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:57.904 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:58.267 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:46:58.269 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:58.270 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:58.270 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:46:58.856 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:58.856 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:58.857 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:59.205 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:59.206 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:59.206 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:46:59.961 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:46:59.961 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:46:59.961 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:00.456 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:00.456 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:00.456 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:01.074 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:01.074 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:01.074 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:02.015 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:02.017 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:02.017 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:02.189 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:02.190 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:02.190 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:03.280 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:03.280 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:03.280 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:03.281 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:03.303 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:03.305 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:03.305 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:03.412 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:03.413 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:03.413 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:04.422 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:04.422 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:04.422 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:05.188 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:05.189 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:05.189 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:05.533 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:05.533 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:05.533 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:06.523 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:06.523 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:06.523 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:06.638 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:06.639 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:06.639 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:07.746 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:07.746 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:07.746 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:08.292 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:08.292 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:08.292 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:08.294 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:08.349 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:08.349 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:08.349 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:08.864 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:08.865 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:08.865 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:09.505 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:09.506 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:09.506 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:09.968 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:09.969 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:09.969 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:11.085 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:11.085 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:11.085 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:11.143 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:11.143 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:11.143 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:12.198 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:12.198 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:12.199 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:12.458 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:12.459 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:12.459 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:13.302 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:13.302 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:13.302 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:13.303 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:13.313 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:13.313 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:13.313 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:13.642 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:13.642 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:13.642 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:14.423 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:14.423 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:14.424 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:15.542 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:15.543 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:15.543 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:15.566 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:15.567 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:15.567 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:16.657 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:16.658 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:16.658 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:16.728 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:16.729 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:16.729 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:17.773 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:17.773 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:17.773 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:18.313 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:18.313 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:18.314 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:18.314 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:18.339 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:18.340 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:18.340 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:18.878 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:18.878 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:18.879 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:19.926 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:19.926 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:19.927 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:19.991 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:19.992 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:19.992 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:21.097 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:21.098 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:21.098 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:21.186 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:21.187 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:21.187 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:22.218 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:22.219 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:22.219 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:22.526 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:22.526 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:22.527 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:23.325 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:23.325 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:23.327 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:23.327 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:23.326 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:23.328 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:23.328 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:23.981 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:23.982 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:23.982 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:24.445 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:24.446 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:24.446 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:25.562 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:25.562 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:25.562 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:25.755 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:25.756 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:25.756 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:26.676 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:26.677 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:26.677 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:27.083 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:27.083 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:27.083 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:27.792 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:27.792 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:27.792 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:28.335 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:28.336 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:28.338 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:28.338 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:28.720 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:28.720 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:28.721 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:28.910 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:28.911 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:28.911 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:29.974 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:29.976 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:29.977 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:30.022 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:30.022 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:30.023 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:31.136 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:31.139 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:31.139 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:31.762 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:31.763 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:31.763 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:32.256 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:32.256 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:32.257 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:33.119 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:33.120 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:33.120 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:33.345 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:33.345 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:33.346 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:33.346 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:33.368 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:33.369 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:33.369 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:34.478 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:34.479 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:34.479 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:34.827 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:34.827 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:34.828 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:35.595 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:35.595 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:35.596 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:36.712 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:36.712 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:36.712 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:36.885 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:36.885 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:36.886 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:37.822 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:37.822 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:37.822 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:38.355 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:38.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:38.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:38.355 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:38.519 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:38.519 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:38.519 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:38.936 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:38.936 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:38.936 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:39.969 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:39.970 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:39.970 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:40.053 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:40.053 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:40.053 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:41.162 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:41.162 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:41.162 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:41.210 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:41.210 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:41.210 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:42.274 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:42.274 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:42.274 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:42.426 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:42.426 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:42.426 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:43.356 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-17:47:43.356 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:43.356 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:43.356 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-17:47:43.381 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:43.381 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:43.381 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:44.493 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:44.493 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:44.493 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-17:47:44.510 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-17:47:44.510 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-17:47:44.510 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:05.533 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:05.533 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:05.533 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:05.955 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:05.955 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:05.955 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:06.644 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:06.645 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:06.645 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:07.114 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:45:07.115 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:45:07.115 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:45:07.115 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:45:07.751 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:07.751 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:07.751 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:08.003 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:08.004 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:08.004 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:08.865 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:08.865 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:08.865 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:09.926 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:09.926 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:09.926 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:09.981 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:09.981 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:09.981 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:11.087 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:11.087 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:11.087 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:11.347 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:11.347 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:11.347 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:50.587 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:50.587 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:50.802 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-05:48:51.460 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:51.481 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:51.739 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:51.528 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:48:51.864 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:51.968 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:48:52.146 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:48:53.050 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:53.050 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:53.050 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:53.769 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:53.770 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:53.770 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:54.152 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:55.041 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:55.047 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:55.323 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:55.355 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:55.359 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:56.183 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:56.196 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:56.196 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:57.180 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-05:48:57.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:48:57.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:48:57.228 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:48:57.301 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:57.301 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:57.301 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:57.305 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:57.306 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:57.306 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:58.413 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:58.415 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:58.415 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:59.002 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:59.003 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:59.003 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:48:59.519 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:48:59.520 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:48:59.520 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:00.219 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:00.219 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:00.219 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:00.624 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:00.624 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:00.624 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:01.545 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:01.545 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:01.545 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:01.737 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:01.737 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:01.737 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:02.237 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-05:49:02.237 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:02.238 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:02.238 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:02.852 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:02.853 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:02.853 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:03.651 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:03.652 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:03.652 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:03.957 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:03.957 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:03.958 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:05.070 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:05.070 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:05.070 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:05.399 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:05.399 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:05.399 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:06.181 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:06.181 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:06.181 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:07.249 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-05:49:07.250 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:07.250 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:07.250 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:07.295 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:07.295 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:07.295 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:07.403 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:07.406 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:07.406 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:08.404 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:08.404 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:08.404 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:09.255 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:09.255 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:09.255 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:09.518 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:09.520 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:09.520 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:10.624 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:10.625 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:10.625 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:11.278 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:11.278 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:11.279 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:11.736 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:11.736 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:11.736 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:12.253 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-05:49:12.254 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:12.255 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:12.255 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-05:49:12.604 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:12.604 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:12.604 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-05:49:12.854 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-05:49:12.857 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-05:49:12.857 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:08.348 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:08.357 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:08.531 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:08.534 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:08.529 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:08.534 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:08.537 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:08.534 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:08.579 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:08.596 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:09.697 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:09.698 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:09.698 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.259 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.259 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.260 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.811 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.812 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.812 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:11.917 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:11.918 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:11.919 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:12.263 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:12.263 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:12.263 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:13.030 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:13.030 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:13.031 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:13.617 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:13.618 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:13.619 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:13.619 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:14.133 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:14.133 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:14.133 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:14.353 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:14.355 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:14.355 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:15.242 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:15.242 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:15.243 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:16.280 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:16.280 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:16.280 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:16.350 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:16.351 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:16.351 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:17.459 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:17.460 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:17.460 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:18.194 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:18.195 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:18.195 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:18.561 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:18.561 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:18.562 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:18.623 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:18.625 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:18.625 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:18.625 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:19.603 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:19.604 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:19.605 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:19.675 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:19.676 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:19.676 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:36.820 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:36.820 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:36.820 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:37.461 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:37.461 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:37.462 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:37.922 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:37.935 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:37.935 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:38.521 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:09:38.521 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:38.522 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:38.522 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:39.044 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:39.044 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:39.044 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:39.044 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:39.045 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:39.045 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:40.146 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:40.147 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:40.147 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:40.961 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:40.963 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:40.964 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:41.256 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:41.257 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:41.257 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:42.231 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:42.231 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:42.231 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:42.362 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:42.363 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:42.363 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:43.468 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:43.469 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:43.469 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:43.528 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:09:43.528 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:43.528 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:43.529 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:44.155 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:44.158 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:44.158 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:44.576 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:44.576 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:44.576 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:45.679 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:45.679 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:45.679 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:45.696 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:45.696 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:45.696 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:46.784 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:46.785 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:46.785 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:47.237 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:47.238 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:47.238 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:47.894 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:47.894 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:47.894 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:48.535 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:09:48.537 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:48.537 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:48.537 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:49.003 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:49.004 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:49.004 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:49.135 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:49.136 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:49.136 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:50.109 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:50.158 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:50.158 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:50.823 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:50.824 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:50.824 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:51.263 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:51.264 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:51.264 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:52.371 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:52.371 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:52.371 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:52.548 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:52.548 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:52.548 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:53.485 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:53.486 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:53.486 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:53.538 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:09:53.538 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:53.540 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:53.540 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:54.096 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:54.097 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:54.097 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:54.588 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:54.589 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:54.589 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:55.270 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:55.270 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:55.270 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:55.698 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:55.698 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:55.698 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:56.803 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:56.804 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:56.804 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:57.100 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:57.100 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:57.100 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:57.907 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:57.908 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:57.908 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:58.541 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:09:58.541 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:58.541 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:58.541 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:09:58.693 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:58.694 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:09:58.694 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fced0 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:09:59.016 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:09:59.075 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Socket connection established, initiating session, client: /192.168.43.121:57209, server: 101.37.175.111/101.37.175.111:2181 
-10:09:59.147 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Session establishment complete on server 101.37.175.111/101.37.175.111:2181, sessionid = 0x17559ef9a3fcfb7, negotiated timeout = 40000 
-10:09:59.147 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: RECONNECTED 
-10:10:00.215 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:10:00.274 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Socket connection established, initiating session, client: /192.168.43.121:57229, server: 101.37.175.111/101.37.175.111:2181 
-10:10:00.366 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Unable to reconnect to ZooKeeper service, session 0x17559ef9a3fced0 has expired 
-10:10:00.367 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Unable to reconnect to ZooKeeper service, session 0x17559ef9a3fced0 has expired, closing socket connection 
-10:10:03.886 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:03.886 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:03.886 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:03.886 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:08.888 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:08.888 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:08.889 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:08.889 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:13.893 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:13.893 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:13.894 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:13.894 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:18.900 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:18.900 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:18.900 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:18.901 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:23.906 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:23.906 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:23.906 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:23.906 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:28.911 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:28.912 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:28.912 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:28.912 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:33.914 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:33.914 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:33.914 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:33.914 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:38.916 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:38.916 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:38.917 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:38.917 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:43.922 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:43.923 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:43.923 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:43.925 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:48.930 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:48.931 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:48.932 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:48.932 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:53.936 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:53.936 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:53.936 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:53.936 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:58.942 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:10:58.943 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:58.945 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:10:58.945 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:03.946 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:03.947 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:03.947 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:03.947 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:08.952 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:08.952 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:08.953 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:08.953 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:13.958 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:13.958 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:13.959 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:13.959 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:18.963 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:18.964 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:18.964 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:18.964 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:23.971 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:23.971 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:23.971 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:23.972 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:28.979 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:28.979 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:28.980 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:28.980 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:33.987 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:33.987 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:33.987 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:33.988 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:38.990 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:38.991 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:38.991 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:38.993 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:43.997 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:43.997 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:43.997 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:43.998 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:49.001 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:49.001 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:49.003 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:49.003 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:54.008 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:54.009 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:54.009 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:54.009 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:59.011 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:11:59.012 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:59.012 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:11:59.013 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:04.018 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:04.018 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:04.018 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:04.020 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:09.025 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:09.025 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:09.025 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:09.026 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:14.034 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:14.034 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:14.034 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:14.035 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:19.038 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:19.038 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:19.038 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:19.038 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:24.044 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:24.045 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:24.045 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:24.045 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:29.050 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:29.050 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:29.052 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:29.053 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:34.054 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:34.054 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:34.056 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:34.058 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:39.061 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:39.061 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:39.061 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:39.061 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:44.065 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:44.065 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:44.067 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:44.067 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:49.073 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:49.073 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:49.074 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:49.074 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:54.077 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:54.077 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:54.078 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:54.078 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:59.081 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:12:59.081 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:59.082 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:12:59.082 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:04.088 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:04.088 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:04.088 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:04.089 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:09.093 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:09.094 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:09.094 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:09.094 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:14.099 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:14.099 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:14.102 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:14.102 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:19.108 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:19.109 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:19.110 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:19.110 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:24.114 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:24.114 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:24.115 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:24.115 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:29.117 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:29.117 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:29.119 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:29.119 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:34.125 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:34.126 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:34.126 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:34.126 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:39.133 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:39.133 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:39.133 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:39.133 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:44.135 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:44.136 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:44.136 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:44.136 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:49.143 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:49.144 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:49.144 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:49.145 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:54.150 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:54.151 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:54.152 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:54.152 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:59.156 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:13:59.157 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:59.157 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:13:59.157 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:04.162 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:04.162 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:04.163 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:04.163 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:09.169 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:09.169 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:09.170 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:09.172 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:13.077 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard from server in 26666ms for sessionid 0x17559ef9a3fcfb7 
-10:14:13.077 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard from server in 26666ms for sessionid 0x17559ef9a3fcfb7, closing socket connection and attempting reconnect 
-10:14:13.179 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: SUSPENDED 
-10:14:14.176 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:14.177 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:14.177 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:14.178 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:14.451 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:14.451 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:14.451 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:16.049 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:16.049 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:16.049 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:17.354 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:17.355 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:17.355 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:19.182 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:19.182 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:19.184 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:19.186 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:19.373 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:19.373 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:19.373 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:21.280 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:21.280 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:21.280 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:23.033 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:23.034 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:23.034 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:24.191 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:24.191 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:24.192 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:24.192 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:24.873 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:24.873 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:24.873 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:26.361 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:26.361 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:26.361 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:27.793 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:27.793 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:27.793 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:29.198 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:29.199 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:29.199 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:29.200 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:29.615 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:29.616 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:29.616 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:30.925 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:30.925 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:30.926 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:32.605 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:32.606 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:32.606 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:34.201 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:34.202 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:34.202 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:34.202 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:34.491 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:34.492 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:34.492 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:36.144 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:36.144 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:36.144 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:37.662 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:37.662 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:37.662 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:39.207 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:39.208 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:39.208 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:39.207 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:39.209 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:39.209 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:39.210 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:40.536 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:40.539 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:40.539 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:42.242 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:42.243 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:42.243 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:44.086 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:44.086 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:44.086 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:44.214 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:44.214 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:44.215 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:44.215 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:45.489 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:45.489 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:45.489 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:47.337 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:47.337 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:47.338 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:49.219 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:49.220 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:49.220 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:49.220 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:49.401 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:49.401 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:49.401 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:50.570 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:50.571 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:50.571 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:52.251 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:52.251 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:52.251 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.181 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40001. Adjusted session timeout ms: 40000 
-10:14:53.181 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.182 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.182 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40003. Adjusted session timeout ms: 40000 
-10:14:53.182 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.182 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.184 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.184 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40005. Adjusted session timeout ms: 40000 
-10:14:53.184 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.184 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.185 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40005. Adjusted session timeout ms: 40000 
-10:14:53.185 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.185 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.185 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.185 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.185 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40006. Adjusted session timeout ms: 40000 
-10:14:53.185 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.186 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.186 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.186 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.192 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.193 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.193 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.193 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.193 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.194 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40015. Adjusted session timeout ms: 40000 
-10:14:53.194 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.194 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.194 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40015. Adjusted session timeout ms: 40000 
-10:14:53.194 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.194 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.194 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.195 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40016. Adjusted session timeout ms: 40000 
-10:14:53.195 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.195 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.195 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.195 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40016. Adjusted session timeout ms: 40000 
-10:14:53.195 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.196 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.196 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.196 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.196 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.196 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40017. Adjusted session timeout ms: 40000 
-10:14:53.196 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.196 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.196 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.196 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.196 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.196 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40017. Adjusted session timeout ms: 40000 
-10:14:53.196 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.197 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.197 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40018. Adjusted session timeout ms: 40000 
-10:14:53.197 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.197 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40018. Adjusted session timeout ms: 40000 
-10:14:53.197 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.197 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40018. Adjusted session timeout ms: 40000 
-10:14:53.197 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.197 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40018. Adjusted session timeout ms: 40000 
-10:14:53.197 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.196 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.197 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40018. Adjusted session timeout ms: 40000 
-10:14:53.197 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.197 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.197 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.198 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.198 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.198 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.197 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.198 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.198 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40019. Adjusted session timeout ms: 40000 
-10:14:53.199 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.199 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.199 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.199 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40020. Adjusted session timeout ms: 40000 
-10:14:53.199 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.199 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.199 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.199 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.199 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.199 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.199 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40020. Adjusted session timeout ms: 40000 
-10:14:53.199 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.199 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.199 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.199 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.200 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.200 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.200 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.200 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.200 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.200 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40021. Adjusted session timeout ms: 40000 
-10:14:53.200 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.201 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.201 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.201 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.201 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 40022. Adjusted session timeout ms: 40000 
-10:14:53.201 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.201 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.201 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-10:14:53.201 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.201 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.201 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.201 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.202 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.202 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:53.202 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-10:14:53.202 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: LOST 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x17559ef9a3fcfb7 
-10:14:53.202 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.204 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.205 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:53.202 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.203 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-10:14:53.205 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:54.223 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:54.223 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:54.224 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:54.224 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:54.256 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:54.256 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:54.257 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:54.311 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:54.311 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:54.311 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:55.419 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:55.419 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:55.419 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:55.561 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:55.561 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:55.561 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:56.527 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:56.527 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:56.527 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:57.108 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:57.109 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:57.109 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:57.637 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:57.638 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:57.638 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:58.744 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:58.744 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:58.744 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:59.185 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:59.187 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:59.187 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:14:59.229 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:14:59.229 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:59.235 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:59.236 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:14:59.850 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:14:59.851 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:14:59.851 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:00.338 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:00.339 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:00.339 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:00.960 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:00.960 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:00.960 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:02.068 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:02.069 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:02.069 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:02.413 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:02.414 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:02.414 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:03.175 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:03.176 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:03.176 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:03.920 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:03.921 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:03.921 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:04.243 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:04.243 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:04.245 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:04.245 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:04.285 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:04.285 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:04.285 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:05.393 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:05.393 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:05.394 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:05.540 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:05.541 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:05.541 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:06.500 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:06.501 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:06.501 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:07.458 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:07.458 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:07.458 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:07.603 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:07.616 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:07.616 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:08.727 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:08.728 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:08.728 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:09.109 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:09.110 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:09.110 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:09.250 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:09.250 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:09.251 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:09.251 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:09.833 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:09.834 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:09.834 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:10.662 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:10.681 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:10.681 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:10.940 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:10.940 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:10.940 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:12.000 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:12.000 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:12.001 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:12.048 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:12.049 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:12.049 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:13.153 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:13.154 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:13.154 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:13.437 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:13.437 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:13.437 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:14.255 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:14.255 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:14.257 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:14.257 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:14.257 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:14.255 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:14.257 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:15.308 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:15.308 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:15.309 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:15.363 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:15.363 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:15.363 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:16.470 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:16.471 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:16.471 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:17.370 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:17.371 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:17.371 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:17.576 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:17.576 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:17.576 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:18.686 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:18.686 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:18.687 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:19.265 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:19.265 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:19.265 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:19.266 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:19.289 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:19.290 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:19.290 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:19.790 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:19.790 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:19.790 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:20.722 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:20.723 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:20.723 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:20.897 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:20.898 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:20.898 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:22.006 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:22.006 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:22.006 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:22.179 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:22.179 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:22.179 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:23.107 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:23.107 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:23.107 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:24.002 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:24.002 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:24.002 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:24.210 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:24.211 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:24.211 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:24.272 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:24.273 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:24.273 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:24.275 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:25.318 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:25.318 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:25.318 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:26.094 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:26.094 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:26.094 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:26.425 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:26.425 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:26.425 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:27.538 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:27.538 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:27.538 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:27.946 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:27.946 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:27.946 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:28.645 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:28.645 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:28.645 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:29.281 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:29.281 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:29.281 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:29.282 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:29.549 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:29.550 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:29.550 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:29.756 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:29.756 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:29.756 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:30.861 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:30.861 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:30.861 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:31.461 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:31.461 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:31.461 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:31.972 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:31.972 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:31.972 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:32.998 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:32.999 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:32.999 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:33.081 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:33.081 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:33.081 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:34.190 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:34.191 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:34.191 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:34.284 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:34.284 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:34.285 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:34.285 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:34.840 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:34.840 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:34.841 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:35.294 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:35.295 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:35.295 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:36.201 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:36.201 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:36.201 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:36.402 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:36.402 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:36.402 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:37.506 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:37.506 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:37.506 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:38.292 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:38.292 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:38.292 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:38.612 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:38.613 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:38.613 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:39.288 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:39.289 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:39.400 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:39.400 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:39.718 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:39.745 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:39.746 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:39.940 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:39.941 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:39.941 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:40.852 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:40.852 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:40.852 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:41.448 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:41.448 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:41.449 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:41.958 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:41.958 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:41.958 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:43.065 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:43.066 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:43.066 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:43.284 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:43.284 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:43.284 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:44.171 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:44.171 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:44.171 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:44.407 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:44.421 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:44.422 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:44.446 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:45.031 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:45.031 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:45.032 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:45.280 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:45.280 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:45.280 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:46.385 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:46.385 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:46.386 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:47.016 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:47.017 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:47.017 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:47.496 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:47.496 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:47.496 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:48.604 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:48.604 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:48.604 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:48.985 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:48.985 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:48.985 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:49.447 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:49.448 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:49.448 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:49.448 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:49.714 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:49.715 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:49.715 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:50.568 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:50.569 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:50.569 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:50.821 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:50.822 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:50.822 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:51.923 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:51.923 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:51.923 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:52.263 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:52.264 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:52.264 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:53.040 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:53.041 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:53.041 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:53.806 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:53.806 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:53.806 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:54.158 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:54.159 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:54.159 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:54.456 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:54.456 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:54.456 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:54.456 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:55.279 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:55.281 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:55.281 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:55.923 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:55.924 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:55.924 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:56.396 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:56.396 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:56.397 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:57.241 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:57.241 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:57.242 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:57.513 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:57.514 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:57.514 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:58.603 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:58.603 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:58.604 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:58.629 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:58.630 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:58.630 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:15:59.459 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:15:59.461 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:59.462 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:59.462 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:15:59.742 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:15:59.745 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:15:59.745 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:00.343 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:00.344 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:00.344 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:00.854 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:00.855 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:00.855 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:01.969 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:01.970 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:01.970 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:02.218 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:02.218 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:02.218 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:03.084 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:03.085 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:03.085 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:03.963 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:03.964 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:03.964 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:04.198 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:04.199 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:04.199 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:04.470 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-10:16:04.472 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:16:04.474 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:16:04.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-10:16:05.307 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:05.307 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:05.307 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:05.422 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:05.423 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:05.423 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:06.417 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:06.418 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:06.418 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:06.980 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:06.980 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:06.980 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:07.525 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:07.525 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:07.525 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:08.287 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:08.287 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:08.287 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-10:16:08.636 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-10:16:08.637 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-10:16:08.637 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:07.868 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:07.868 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:07.869 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:07.869 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:07.869 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:07.869 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:07.909 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-22:17:07.910 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:07.911 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:07.992 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:08.970 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:08.970 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:08.970 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:09.804 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:09.805 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:09.805 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:10.077 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:10.077 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:10.077 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:11.187 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:11.187 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:11.188 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:11.749 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:11.749 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:11.749 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:12.298 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:12.298 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:12.298 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:12.999 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-22:17:12.999 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:13.001 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:13.002 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:13.406 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:13.406 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:13.406 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:13.406 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:13.406 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:13.406 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:14.508 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:14.508 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:14.509 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:15.103 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:15.103 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:15.103 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:15.623 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:15.623 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:15.623 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:16.731 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:16.731 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:16.731 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:16.733 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:16.733 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:16.733 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:17.843 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:17.844 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:17.844 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:18.010 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-22:17:18.011 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:18.011 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:18.014 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-22:17:18.574 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:18.575 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:18.575 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-22:17:18.951 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-22:17:18.951 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-22:17:18.952 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:04.900 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:04.901 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:04.901 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:04.900 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:04.902 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:04.903 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:06.019 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:06.020 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:06.020 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:06.205 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:06.205 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:06.205 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:07.139 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:07.139 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:07.139 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:07.276 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:45:07.276 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:45:07.278 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:45:07.280 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:45:07.366 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:07.367 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:07.367 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:08.249 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:08.249 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:08.249 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:08.869 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:08.869 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:08.869 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:09.359 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:09.359 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:09.359 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:10.479 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:10.479 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:10.479 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:10.758 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:10.758 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:10.759 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:45:11.591 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:45:11.591 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:45:11.591 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.244 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.542 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.735 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.735 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.766 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.766 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.870 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:10.871 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:10.938 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:10.944 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:11.906 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:11.907 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:11.908 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:12.302 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:12.302 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:12.302 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:13.062 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:13.064 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:13.066 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:14.170 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:14.171 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:14.171 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:14.322 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:14.324 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:14.324 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:15.282 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:15.410 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:15.410 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:15.580 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:15.638 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:15.638 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:15.951 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:15.952 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:15.952 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:15.953 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:16.518 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:16.518 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:16.518 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:17.619 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:17.620 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:17.620 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:17.747 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:17.748 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:17.749 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:18.726 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:18.726 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:18.726 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:19.453 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:19.454 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:19.455 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:52.164 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:52.165 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:52.165 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:52.389 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:12:52.389 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:12:52.393 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:12:52.393 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:12:53.275 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:53.278 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:53.278 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:53.909 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:54.144 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:54.160 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:54.428 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:54.449 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:54.471 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:55.577 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:55.577 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:55.577 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:56.037 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:56.038 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:56.039 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:56.681 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:56.681 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:56.681 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:57.396 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:12:57.396 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:12:57.398 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:12:57.398 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:12:57.784 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:57.784 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:57.784 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:57.826 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:57.826 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:57.826 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:58.890 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:58.891 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:58.891 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:12:59.161 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:12:59.161 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:12:59.161 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:00.000 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:00.001 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:00.002 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:01.055 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:01.055 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:01.055 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:01.108 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:01.108 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:01.108 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:02.213 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:02.214 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:02.214 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:02.400 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:02.401 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:02.404 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:02.406 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:02.514 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:02.514 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:02.514 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:03.320 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:03.320 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:03.322 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:04.424 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:04.424 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:04.425 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:04.498 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:04.499 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:04.499 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:05.529 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:05.529 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:05.530 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:05.906 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:05.906 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:05.906 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:06.636 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:06.763 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:06.764 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:07.410 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:07.410 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:07.412 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:07.413 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:07.870 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:07.887 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:07.887 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:07.932 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:07.932 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-11:13:07.932 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fcfb7 for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-11:13:08.996 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:09.058 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Socket connection established, initiating session, client: /192.168.43.121:60475, server: 101.37.175.111/101.37.175.111:2181 
-11:13:09.151 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Session establishment complete on server 101.37.175.111/101.37.175.111:2181, sessionid = 0x17559ef9a3fd0ec, negotiated timeout = 40000 
-11:13:09.153 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: RECONNECTED 
-11:13:09.870 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-11:13:09.931 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Socket connection established, initiating session, client: /192.168.43.121:60488, server: 101.37.175.111/101.37.175.111:2181 
-11:13:09.997 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Unable to reconnect to ZooKeeper service, session 0x17559ef9a3fcfb7 has expired 
-11:13:09.998 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Unable to reconnect to ZooKeeper service, session 0x17559ef9a3fcfb7 has expired, closing socket connection 
-11:13:12.106 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:12.106 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:12.107 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:12.108 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:17.113 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:17.114 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:17.118 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:17.121 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:22.124 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:22.127 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:22.128 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:22.128 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:27.131 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:27.131 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:27.133 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:27.133 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:32.137 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:32.137 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:32.137 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:32.138 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:37.141 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:37.141 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:37.144 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:37.145 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:42.151 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:42.151 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:42.155 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:42.156 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:47.163 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:47.163 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:47.165 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:47.165 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:52.171 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:52.171 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:52.172 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:52.173 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:57.179 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:13:57.179 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:57.179 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:13:57.180 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:02.185 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:02.185 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:02.188 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:02.188 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:07.193 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:07.193 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:07.196 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:07.198 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:12.202 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:12.203 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:12.206 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:12.206 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:17.210 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:17.212 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:17.212 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:17.213 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:22.217 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:22.218 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:22.221 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:22.222 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:27.225 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:27.225 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:27.226 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:27.227 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:32.233 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:32.233 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:32.233 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:32.233 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:37.240 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:37.240 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:37.243 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:37.243 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:42.252 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:42.253 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:42.253 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:42.253 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:47.261 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:47.261 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:47.261 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:47.262 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:52.269 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:52.269 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:52.269 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:52.271 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:57.275 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:14:57.275 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:57.276 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:14:57.276 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:02.278 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:02.278 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:02.279 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:02.279 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:07.282 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:07.283 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:07.283 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:07.283 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:12.286 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:12.286 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:12.286 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:12.287 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:17.293 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:17.293 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:17.295 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:17.295 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:22.301 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:22.301 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:22.302 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:22.302 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:27.308 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:27.310 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:27.311 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:27.311 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:32.316 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:32.316 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:32.317 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:32.317 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:37.323 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:37.323 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:37.325 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:37.326 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:42.329 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:42.331 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:42.331 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:42.332 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:47.333 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:47.333 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:47.333 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:47.333 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:52.338 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:52.339 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:52.339 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:52.341 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:57.341 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:15:57.341 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:57.343 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:15:57.343 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:02.349 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:02.350 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:02.353 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:02.354 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:07.357 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:07.358 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:07.358 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:07.358 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:12.365 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:12.365 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:12.365 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:12.366 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:17.374 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:17.375 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:17.375 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:17.375 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:22.379 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:22.379 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:22.380 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:22.381 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:27.382 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:27.383 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:27.383 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:27.383 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:32.388 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:32.388 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:32.390 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:32.391 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:37.394 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:37.394 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:37.395 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:37.395 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:42.398 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:42.399 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:42.401 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:42.401 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:47.404 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:47.404 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:47.404 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:47.404 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:52.412 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:52.412 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:52.413 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:52.414 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:57.419 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:16:57.420 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:57.420 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:16:57.420 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:02.427 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:02.428 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:02.428 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:02.429 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:07.434 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:07.437 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:07.438 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:07.438 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:12.443 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:12.443 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:12.445 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:12.445 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:17.451 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:17.451 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:17.452 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:17.452 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:22.457 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:22.457 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:22.458 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:22.459 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:27.464 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:27.465 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:27.465 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:27.468 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:32.474 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:32.474 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:32.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:32.475 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:37.480 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:37.481 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:37.481 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:37.483 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:42.488 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:42.488 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:42.489 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:42.489 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:47.496 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:47.496 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:47.496 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:47.497 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:52.504 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:52.505 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:52.505 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:52.505 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:57.507 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:17:57.509 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:57.512 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:17:57.513 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:02.518 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:02.518 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:02.519 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:02.519 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:07.522 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:07.522 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:07.522 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:07.525 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:12.530 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:12.530 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:12.531 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:12.531 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:17.533 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:17.533 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:17.534 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:17.534 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:22.535 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:22.535 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:22.536 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:22.536 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:27.539 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:27.539 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:27.539 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:27.539 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:32.546 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:32.546 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:32.547 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:32.547 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:37.549 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:37.550 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:37.550 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:37.550 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:42.556 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:42.556 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:42.556 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:42.556 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:47.562 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:47.563 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:47.566 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:47.566 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:52.568 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:52.569 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:52.569 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:52.569 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:57.574 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:18:57.574 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:57.574 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:18:57.575 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:02.576 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:02.577 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:02.577 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:02.579 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:07.584 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:07.584 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:07.585 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:07.585 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:12.589 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:12.589 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:12.590 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:12.590 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:17.592 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:17.592 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:17.593 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:17.593 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:22.599 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:22.599 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:22.599 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:22.600 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:27.604 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:27.604 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:27.605 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:27.605 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:32.611 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:32.611 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:32.611 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:32.611 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:37.619 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:37.619 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:37.620 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:37.620 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:42.626 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:42.629 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:42.629 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:42.629 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:47.639 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:47.639 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:47.639 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:47.640 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:52.648 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-11:19:52.648 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:52.648 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-11:19:52.649 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:20:55.564 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:20:55.565 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:20:55.608 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:20:55.609 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:21:00.617 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:21:00.617 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:21:00.617 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:21:00.617 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:21:05.627 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:21:05.627 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:21:05.628 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:21:05.628 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:03.666 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:30:03.666 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:03.666 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:03.666 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:04.758 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard from server in 26672ms for sessionid 0x17559ef9a3fd0ec 
-23:30:04.758 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard from server in 26672ms for sessionid 0x17559ef9a3fd0ec, closing socket connection and attempting reconnect 
-23:30:04.862 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: SUSPENDED 
-23:30:06.501 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:30:06.501 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:30:06.501 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fd0ec for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:30:07.857 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:30:07.857 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:30:07.858 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fd0ec for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:30:08.675 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-23:30:08.676 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:08.676 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:08.676 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-23:30:09.535 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:30:09.537 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:30:09.537 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fd0ec for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:30:11.462 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:30:11.463 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:30:11.463 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fd0ec for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-23:30:13.035 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-23:30:13.036 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-23:30:13.036 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fd0ec for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:09.370 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:09.093 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30604152. Adjusted session timeout ms: 40000 
-08:00:10.198 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.002 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:10.361 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.349 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.362 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x17559ef9a3fd0ec for server 101.37.175.111/101.37.175.111:2181, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.360 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:10.383 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:10.386 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605524. Adjusted session timeout ms: 40000 
-08:00:10.386 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-08:00:10.427 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.427 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605565. Adjusted session timeout ms: 40000 
-08:00:10.431 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-08:00:10.457 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-08:00:10.475 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.475 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.475 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-08:00:10.475 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.475 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-08:00:10.476 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-08:00:10.475 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605613. Adjusted session timeout ms: 40000 
-08:00:10.476 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.477 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.477 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605615. Adjusted session timeout ms: 40000 
-08:00:10.477 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-08:00:10.479 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.479 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-08:00:10.479 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605617. Adjusted session timeout ms: 40000 
-08:00:10.479 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.479 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-08:00:10.479 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.480 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.480 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605618. Adjusted session timeout ms: 40000 
-08:00:10.480 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.480 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605618. Adjusted session timeout ms: 40000 
-08:00:10.480 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.480 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605618. Adjusted session timeout ms: 40000 
-08:00:10.480 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.480 [Curator-ConnectionStateManager-0] WARN  o.a.c.f.s.ConnectionStateManager - Session timeout has elapsed while SUSPENDED. Injecting a session expiration. Elapsed ms: 30605618. Adjusted session timeout ms: 40000 
-08:00:10.477 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.480 [Curator-ConnectionStateManager-0] INFO  o.a.zookeeper.ZooKeeperTestable - injectSessionExpiration() called 
-08:00:10.481 [main-EventThread] WARN  org.apache.curator.ConnectionState - Session expired event received 
-08:00:10.481 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.481 [main-EventThread] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=101.37.175.111:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@3c7cfcbb 
-08:00:10.481 [main-EventThread] INFO  o.a.c.f.s.ConnectionStateManager - State change: LOST 
-08:00:10.481 [main-EventThread] INFO  o.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 4194304 Bytes 
-08:00:10.481 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-08:00:10.481 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-08:00:10.481 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.481 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x17559ef9a3fd0ec 
-08:00:10.483 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:10.486 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:10.486 [main-EventThread] INFO  org.apache.zookeeper.ClientCnxn - EventThread shut down for session: 0x0 
-08:00:10.488 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:10.488 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:11.593 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:13.549 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:13.576 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:14.903 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:15.073 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:15.076 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:15.392 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-08:00:15.392 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:15.393 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:15.394 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-08:00:16.185 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:16.185 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:16.186 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:17.289 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:17.290 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:17.290 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-08:00:18.390 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-08:00:18.391 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-08:00:18.391 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-19:50:05.224 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-19:50:05.225 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-19:50:05.227 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-19:50:05.227 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-19:50:05.568 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-19:50:05.568 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-19:50:05.568 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-19:50:06.671 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-19:50:06.671 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-19:50:06.671 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-19:50:07.771 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-19:50:07.771 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-19:50:07.771 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:36.602 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:36.608 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:34:36.677 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:36.680 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:36.701 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:36.703 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:36.704 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:38.017 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:38.017 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:38.018 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:39.122 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:39.123 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:39.123 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:40.226 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:41.713 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:34:46.448 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:46.480 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:46.453 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:46.663 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:46.664 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:47.768 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:47.823 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:47.829 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:48.930 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:48.931 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:48.932 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:50.032 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:50.032 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:50.032 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:51.157 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:51.196 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:51.196 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:51.684 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:34:51.685 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:51.688 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:51.689 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:52.300 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:52.301 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:52.301 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:53.406 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:53.406 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:53.406 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:54.512 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:54.512 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:54.512 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:55.618 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:55.618 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:55.618 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:56.696 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:34:56.718 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:56.723 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:56.747 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:56.747 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:56.747 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:34:56.747 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:57.851 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:57.851 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:57.851 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:34:58.958 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:34:58.958 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:34:58.959 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:00.064 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:00.065 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:00.065 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:01.171 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:01.171 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:01.171 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:01.753 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:35:01.753 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:01.753 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:01.754 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:02.286 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:02.286 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:02.286 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:03.394 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:03.394 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:03.394 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:04.497 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:04.509 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:04.509 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:05.618 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:05.621 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:05.621 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:06.728 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:06.729 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:06.730 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:06.758 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:35:06.758 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:06.759 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:06.759 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:07.832 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:07.833 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:07.833 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:08.937 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:08.937 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:08.937 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:10.044 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:10.044 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:10.044 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:11.150 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:11.150 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:11.150 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:11.764 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:35:11.764 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:11.765 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:11.765 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:12.257 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:12.257 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:12.258 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:13.362 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:13.372 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:13.372 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:14.476 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:14.476 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:14.477 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:15.584 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:15.584 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:15.584 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:16.690 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:16.690 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:16.690 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:16.770 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:35:16.770 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:16.770 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:16.771 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:17.795 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:17.795 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:17.795 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:18.900 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:18.900 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:18.900 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:20.009 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:20.009 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:20.009 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:21.112 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:21.113 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:21.113 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:21.776 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:35:21.776 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:21.778 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:21.778 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:22.222 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:22.222 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:22.222 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:23.330 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:23.330 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:23.331 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:24.436 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:24.436 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:24.437 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:25.543 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:25.544 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:25.544 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:26.653 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:26.654 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:26.655 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:26.783 [com.alibaba.nacos.naming.beat.sender] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance/beat?beat=%7B%22cluster%22%3A%22DEFAULT%22%2C%22ip%22%3A%22192.168.43.121%22%2C%22metadata%22%3A%7B%22preserved.register.source%22%3A%22SPRING_CLOUD%22%7D%2C%22period%22%3A5000%2C%22port%22%3A8090%2C%22scheduled%22%3Afalse%2C%22serviceName%22%3A%22DEFAULT_GROUP%40%40mooctest-crowdsource-backend%22%2C%22stopped%22%3Afalse%2C%22weight%22%3A1.0%7D&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8&namespaceId=public from 127.0.0.1 
-21:35:26.783 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)
-	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:85)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:26.784 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:26.784 [com.alibaba.nacos.naming.beat.sender] ERROR com.alibaba.nacos.client.naming - [CLIENT-BEAT] failed to send beat: {"cluster":"DEFAULT","ip":"192.168.43.121","metadata":{"preserved.register.source":"SPRING_CLOUD"},"period":5000,"port":8090,"scheduled":false,"serviceName":"DEFAULT_GROUP@@mooctest-crowdsource-backend","stopped":false,"weight":1.0} 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance/beat after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.sendBeat(NamingProxy.java:309)
-	at com.alibaba.nacos.client.naming.beat.BeatReactor$BeatTask.run(BeatReactor.java:92)
-	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
-	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
-	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
-	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
-	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
-	at java.lang.Thread.run(Thread.java:748)
-21:35:27.756 [Thread-41] INFO  c.a.c.n.r.NacosServiceRegistry - De-registering from Nacos Server now... 
-21:35:27.757 [Thread-41] INFO  com.alibaba.nacos.client.naming - [BEAT] removing beat: DEFAULT_GROUP@@mooctest-crowdsource-backend:192.168.43.121:8090 from beat map. 
-21:35:27.757 [Thread-41] INFO  com.alibaba.nacos.client.naming - [DEREGISTER-SERVICE] public deregistering service DEFAULT_GROUP@@mooctest-crowdsource-backend with instance: {"clusterName":"DEFAULT","enabled":true,"ephemeral":true,"healthy":true,"instanceHeartBeatInterval":5000,"instanceHeartBeatTimeOut":15000,"ip":"192.168.43.121","ipDeleteTimeout":30000,"metadata":{},"port":8090,"weight":1.0} 
-21:35:27.759 [Thread-41] WARN  com.alibaba.nacos.client.naming - failed to request http://127.0.0.1:8848/nacos/v1/ns/instance?namespaceId=public&port=8090&clusterName=DEFAULT&ip=192.168.43.121&ephemeral=true&serviceName=DEFAULT_GROUP%40%40mooctest-crowdsource-backend&encoding=UTF-8 from 127.0.0.1 
-21:35:27.760 [Thread-41] ERROR com.alibaba.nacos.client.naming - [NA] failed to request  
-java.net.ConnectException: Connection refused (Connection refused)
-	at java.net.PlainSocketImpl.socketConnect(Native Method)
-	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
-	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
-	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
-	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
-	at java.net.Socket.connect(Socket.java:589)
-	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
-	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
-	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
-	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
-	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
-	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
-	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
-	at com.alibaba.nacos.client.naming.net.HttpClient.request(HttpClient.java:89)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:410)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.deregisterService(NamingProxy.java:205)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:244)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:231)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:221)
-	at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.deregister(NacosServiceRegistry.java:85)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.deregister(AbstractAutoServiceRegistration.java:256)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.stop(AbstractAutoServiceRegistration.java:271)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.destroy(AbstractAutoServiceRegistration.java:208)
-	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
-	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
-	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
-	at java.lang.reflect.Method.invoke(Method.java:498)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeDestroyMethods(InitDestroyAnnotationBeanPostProcessor.java:321)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:156)
-	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:240)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1055)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1062)
-	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1057)
-	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1026)
-	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:945)
-21:35:27.761 [Thread-41] ERROR com.alibaba.nacos.client.naming - request 127.0.0.1:8848 failed. 
-com.alibaba.nacos.api.exception.NacosException: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.callServer(NamingProxy.java:424)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:451)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.deregisterService(NamingProxy.java:205)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:244)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:231)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:221)
-	at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.deregister(NacosServiceRegistry.java:85)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.deregister(AbstractAutoServiceRegistration.java:256)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.stop(AbstractAutoServiceRegistration.java:271)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.destroy(AbstractAutoServiceRegistration.java:208)
-	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
-	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
-	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
-	at java.lang.reflect.Method.invoke(Method.java:498)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeDestroyMethods(InitDestroyAnnotationBeanPostProcessor.java:321)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:156)
-	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:240)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1055)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1062)
-	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1057)
-	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1026)
-	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:945)
-21:35:27.761 [Thread-41] ERROR c.a.c.n.r.NacosServiceRegistry - ERR_NACOS_DEREGISTER, de-register failed...NacosRegistration{nacosDiscoveryProperties=NacosDiscoveryProperties{serverAddr='127.0.0.1:8848', endpoint='', namespace='', watchDelay=30000, logName='', service='mooctest-crowdsource-backend', weight=1.0, clusterName='DEFAULT', namingLoadCacheAtStart='false', metadata={preserved.register.source=SPRING_CLOUD}, registerEnabled=true, ip='192.168.43.121', networkInterface='', port=8090, secure=false, accessKey='', secretKey=''}}, 
-java.lang.IllegalStateException: failed to req API:/nacos/v1/ns/instance after all servers([127.0.0.1:8848]) tried: failed to req API:127.0.0.1:8848/nacos/v1/ns/instance. code:500 msg: java.net.ConnectException: Connection refused (Connection refused)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:464)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.reqAPI(NamingProxy.java:386)
-	at com.alibaba.nacos.client.naming.net.NamingProxy.deregisterService(NamingProxy.java:205)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:244)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:231)
-	at com.alibaba.nacos.client.naming.NacosNamingService.deregisterInstance(NacosNamingService.java:221)
-	at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.deregister(NacosServiceRegistry.java:85)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.deregister(AbstractAutoServiceRegistration.java:256)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.stop(AbstractAutoServiceRegistration.java:271)
-	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.destroy(AbstractAutoServiceRegistration.java:208)
-	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
-	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
-	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
-	at java.lang.reflect.Method.invoke(Method.java:498)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeDestroyMethods(InitDestroyAnnotationBeanPostProcessor.java:321)
-	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:156)
-	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:240)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1055)
-	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504)
-	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1062)
-	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1057)
-	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1026)
-	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:945)
-21:35:27.762 [Thread-41] INFO  c.a.c.n.r.NacosServiceRegistry - De-registration finished. 
-21:35:27.762 [main-SendThread(101.37.175.111:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 101.37.175.111/101.37.175.111:2181. Will not attempt to authenticate using SASL (unknown error) 
-21:35:27.762 [main-SendThread(101.37.175.111:2181)] ERROR o.a.zookeeper.ClientCnxnSocketNIO - Unable to open socket to 101.37.175.111/101.37.175.111:2181 
-21:35:27.762 [main-SendThread(101.37.175.111:2181)] WARN  org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect 
-java.net.SocketException: Network is unreachable
-	at sun.nio.ch.Net.connect0(Native Method)
-	at sun.nio.ch.Net.connect(Net.java:454)
-	at sun.nio.ch.Net.connect(Net.java:446)
-	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:275)
-	at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:285)
-	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1098)
-	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1133)
-21:35:27.764 [Thread-41] INFO  o.s.s.c.ThreadPoolTaskExecutor - Shutting down ExecutorService 'applicationTaskExecutor' 
-21:35:27.792 [Thread-41] INFO  org.mongodb.driver.connection - Closed connection [connectionId{localValue:2, serverValue:147}] to localhost:27017 because the pool has been closed. 

logs/recommend.log.2021-04-26.log

@@ -1,76 +0,0 @@
-20:05:11.557 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619438711557,description:,img_url:,bug_page:出行服务,case_id:105,
-similarJson:
-20:05:12.960 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619438712960,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:45.319 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619438745319,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:46.175 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:0,title:,report_id:,create_time_millis:1619438746175,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:47.023 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:,report_id:,create_time_millis:1619438747023,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:49.711 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619438749711,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:49.718 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619438749718,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:51.208 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619438751208,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:05:51.870 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619438751869,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:
-20:06:42.140 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619438802139,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:55.0,
-
-20:06:42.620 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619438802619,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:95.0,
-
-20:15:50.366 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619439350365,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:55.0,
-
-20:15:50.868 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619439350866,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:95.0,
-
-20:20:04.913 [http-nio-8090-exec-7] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619439604912,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:55.0,
-
-20:20:05.412 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619439605411,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:95.0,
-
-20:21:21.507 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619439681507,description:,img_url:,bug_page:个人中心,case_id:105,
-similarJson:
-20:21:22.823 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619439682823,description:,img_url:,bug_page:个人中心-任务,case_id:105,
-similarJson:
-20:21:23.825 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619439683825,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:25.386 [http-nio-8090-exec-7] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619439685386,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:26.923 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:0,title:,report_id:,create_time_millis:1619439686923,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:28.134 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:,report_id:,create_time_millis:1619439688134,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:30.160 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:df,report_id:,create_time_millis:1619439690160,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:31.661 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:a's'd,report_id:,create_time_millis:1619439691661,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:32.484 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:,create_time_millis:1619439692484,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:33.163 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:,create_time_millis:1619439693163,description:,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:34.161 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:,create_time_millis:1619439694161,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:21:38.891 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:,create_time_millis:1619439698891,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:
-20:43:36.719 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619441016717,description:,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:55.0,
-serialVersionUID:null,id:6086b061b191924de7576757,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:6086ac64b191924de7576752,create_time_millis:1619439713795,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,score:40.0,
-
-20:43:37.217 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:,create_time_millis:1619441017216,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,
-similarJson:serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:95.0,
-serialVersionUID:null,id:6086b061b191924de7576757,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:6086ac64b191924de7576752,create_time_millis:1619439713795,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,score:40.0,
-
-20:48:33.728 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:,create_time_millis:1619441313714,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:serialVersionUID:null,id:6086b061b191924de7576757,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:6086ac64b191924de7576752,create_time_millis:1619439713795,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,score:100.0,
-serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:45.0,
-
-20:48:33.728 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:,create_time_millis:1619441313714,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,
-similarJson:serialVersionUID:null,id:6086b061b191924de7576757,case_take_id:105-166,bug_category:其他,severity:5,recurrent:5,title:阿萨德a,report_id:6086ac64b191924de7576752,create_time_millis:1619439713795,description:阿斯顿发,img_url:,bug_page:个人中心-任务-等级获取,case_id:105,score:100.0,
-serialVersionUID:null,id:6086ac9fb191924de7576754,case_take_id:105-166,bug_category:功能不完整,severity:2,recurrent:1,title:测试一下,report_id:6086ac64b191924de7576752,create_time_millis:1619438751964,description:测试一下,img_url:,bug_page:出行服务-余票查询,case_id:105,score:45.0,
-

logs/recommend.log.2021-04-30.log

@@ -1,146 +0,0 @@
-10:18:53.575 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619749133561,description:,img_url:,bug_page:牛人专线,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035416,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:周边游古镇页面出现,report_id:10010000035309,create_time_millis:1542362093300,description:打开途牛官网，点击跟团游-牛人专线-周边游，点击婺源篁岭，跳转页面出现404错误，显示“牛牛正在休息哦！”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449296365/1542449296365_07.png,bug_page:牛人专线-周边游-悠悠古镇,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035415,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:牛人新品页面中电话号码可,report_id:10010000035317,create_time_millis:1542362060230,description:1、登录途牛旅游网
-2、鼠标悬停至“跟团游”
-3、点击“牛人专线”
-4、点击“牛人新品”
-5、使用谷歌浏览器打开界面进行测试
-6、鼠标移至电话号码处可点击，但是无页面弹出,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449283075/1542449283075_电话号码2.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035414,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:游地区推荐标题显示重复,report_id:10010000035307,create_time_millis:1542362027160,description:1.选择境内游地区为北京
-2.推荐标题显示重复,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449201394/1542449201394_9.png,bug_page:牛人专线-境内游-地区选择,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035413,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:4,title:后进入页面,report_id:10010000035322,create_time_millis:1542361994090,description:点击牛人初体验的图片后，没有像点击其他图片一样进入页面。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449219859/1542449219859_捕获.PNG,bug_page:牛人专线-周边游,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035379,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:4,recurrent:5,title:牛人专线页面缩放排版错误,report_id:10010000035308,create_time_millis:1542360902780,description:页面缩放后应和原网页排版布局相同，实际上缩放后页面右上侧的吃住升级、行程合理、资深导游、无强制性消费，这个板块会缩在牛专目的地、牛人新品的下面，显示重叠,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447891120/1542447891120_7J7@M]O1$R4}{4()Z8MJ9LQ.png,undefined,bug_page:牛人专线,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035378,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:有部分字体没有显示用户,report_id:10010000035316,create_time_millis:1542360869710,description:在牛专目的地、牛人新品、首付出发中字体显示不全面,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447848335/1542447848335_捕获.PNG,bug_page:牛人专线-热门目的地-牛专目的地,case_id:1490,score:5.0,
-
-10:18:54.964 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619749134958,description:,img_url:,bug_page:牛人专线-热门目的地,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035338,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:,report_id:10010000035308,create_time_millis:1542359613050,description:价格区间设为0-0.1，查询结果错误,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446341088/1542446341088_Z]D@AZ7ZOTL4@QHAX8E7(H8.png,undefined,http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446361360/1542446361360_Z]D@AZ7ZOTL4@QHAX8E7(H8.png,bug_page:牛人专线-热门目的地,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035415,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:牛人新品页面中电话号码可,report_id:10010000035317,create_time_millis:1542362060230,description:1、登录途牛旅游网
-2、鼠标悬停至“跟团游”
-3、点击“牛人专线”
-4、点击“牛人新品”
-5、使用谷歌浏览器打开界面进行测试
-6、鼠标移至电话号码处可点击，但是无页面弹出,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449283075/1542449283075_电话号码2.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035378,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:有部分字体没有显示用户,report_id:10010000035316,create_time_millis:1542360869710,description:在牛专目的地、牛人新品、首付出发中字体显示不全面,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447848335/1542447848335_捕获.PNG,bug_page:牛人专线-热门目的地-牛专目的地,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-
-10:18:56.290 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:功能不完整,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619749136282,description:,img_url:,bug_page:牛人专线-热门目的地,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035338,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:,report_id:10010000035308,create_time_millis:1542359613050,description:价格区间设为0-0.1，查询结果错误,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446341088/1542446341088_Z]D@AZ7ZOTL4@QHAX8E7(H8.png,undefined,http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446361360/1542446361360_Z]D@AZ7ZOTL4@QHAX8E7(H8.png,bug_page:牛人专线-热门目的地,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035340,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:,report_id:10010000035312,create_time_millis:1542359679190,description:牛新品页面，最后一个标签无效。,img_url:,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035323,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:牛人新品出现无功能按钮,report_id:10010000035304,create_time_millis:1542359150070,description:牛人新品右侧线路最下面的按钮，点击后没有反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542445828766/1542445828766_屏幕截图(6).png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035487,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:牛转目的地界面概要信息价格消息价格显示,report_id:10010000035307,create_time_millis:1542366916970,description:1.进入牛专目的地界面
-2.概要信息价格与详细信息价格不一致,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542453950240/1542453950240_18.png,http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542453958078/1542453958078_18-1.png,bug_page:牛人专线-热门目的地-牛专目的地,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035493,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:牛目的地界面包含牛人专线内容,report_id:10010000035307,create_time_millis:1542367462420,description:1.进入牛专目的地界面
-2.界面内容包含非牛人专线内容,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542454171222/1542454171222_19.png,bug_page:牛人专线-热门目的地-牛专目的地,case_id:1490,score:15.0,
-
-10:18:57.479 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:功能不完整,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619749137474,description:,img_url:,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035340,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:,report_id:10010000035312,create_time_millis:1542359679190,description:牛新品页面，最后一个标签无效。,img_url:,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035468,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:5,title:牛人新品页面浏览器标题显示错误,report_id:10010000035309,create_time_millis:1542364953350,description:打开途牛官网，点击跟团游-牛人专线-热门目的地-牛人新品，在牛人新品页面中，浏览器标题显示错误。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542452075249/1542452075249_12.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035323,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:牛人新品出现无功能按钮,report_id:10010000035304,create_time_millis:1542359150070,description:牛人新品右侧线路最下面的按钮，点击后没有反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542445828766/1542445828766_屏幕截图(6).png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035345,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:,report_id:10010000035312,create_time_millis:1542359811470,description:牛人新品页面，右侧最后一个标签，点击后没有跳转到对应板块,img_url:,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035474,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:5,title:右侧菜单按钮可范围,report_id:10010000035304,create_time_millis:1542365607890,description:点击牛人新品右侧的菜单键的文字部分才会跳转到相关页面，点击按钮内文字外的地方无法跳转,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542452539589/1542452539589_屏幕截图(21).png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-
-10:18:58.581 [http-nio-8090-exec-7] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:0,title:,report_id:,create_time_millis:1619749138576,description:,img_url:,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035468,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:5,title:牛人新品页面浏览器标题显示错误,report_id:10010000035309,create_time_millis:1542364953350,description:打开途牛官网，点击跟团游-牛人专线-热门目的地-牛人新品，在牛人新品页面中，浏览器标题显示错误。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542452075249/1542452075249_12.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:25.0,
-serialVersionUID:null,id:10010000035370,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:5,title:牛人新品里面右侧悬浮栏下空白悬浮栏无,report_id:10010000035342,create_time_millis:1542360605150,description:点击“跟团游”--“牛人专线“--找到”热门目的地“，点击”牛人新品“，进入牛人新品往下拉页面右侧会出现悬浮栏，点击最后一个空白悬浮栏，无任何反应。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447580981/1542447580981_微信图片_20181117172511.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:25.0,
-serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035332,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品中点左侧抢购按钮右侧无字符部分无,report_id:10010000035311,create_time_millis:1542359414630,description:进入牛人新品后点击左侧按钮无字符部分无反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446029853/1542446029853_c4bb825350776f838c584e8697d2f08.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-
-10:18:59.492 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:2,title:,report_id:,create_time_millis:1619749139486,description:,img_url:,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035468,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:5,title:牛人新品页面浏览器标题显示错误,report_id:10010000035309,create_time_millis:1542364953350,description:打开途牛官网，点击跟团游-牛人专线-热门目的地-牛人新品，在牛人新品页面中，浏览器标题显示错误。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542452075249/1542452075249_12.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:25.0,
-serialVersionUID:null,id:10010000035370,case_take_id:1490-2614,bug_category:功能不完整,severity:2,recurrent:5,title:牛人新品里面右侧悬浮栏下空白悬浮栏无,report_id:10010000035342,create_time_millis:1542360605150,description:点击“跟团游”--“牛人专线“--找到”热门目的地“，点击”牛人新品“，进入牛人新品往下拉页面右侧会出现悬浮栏，点击最后一个空白悬浮栏，无任何反应。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447580981/1542447580981_微信图片_20181117172511.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:25.0,
-serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-serialVersionUID:null,id:10010000035332,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品中点左侧抢购按钮右侧无字符部分无,report_id:10010000035311,create_time_millis:1542359414630,description:进入牛人新品后点击左侧按钮无字符部分无反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446029853/1542446029853_c4bb825350776f838c584e8697d2f08.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:20.0,
-
-10:31:41.516 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1490-2614,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619749901490,description:,img_url:,bug_page:牛人专线,case_id:1490,
-similarJson:serialVersionUID:null,id:10010000035416,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:周边游古镇页面出现,report_id:10010000035309,create_time_millis:1542362093300,description:打开途牛官网，点击跟团游-牛人专线-周边游，点击婺源篁岭，跳转页面出现404错误，显示“牛牛正在休息哦！”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449296365/1542449296365_07.png,bug_page:牛人专线-周边游-悠悠古镇,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035415,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:牛人新品页面中电话号码可,report_id:10010000035317,create_time_millis:1542362060230,description:1、登录途牛旅游网
-2、鼠标悬停至“跟团游”
-3、点击“牛人专线”
-4、点击“牛人新品”
-5、使用谷歌浏览器打开界面进行测试
-6、鼠标移至电话号码处可点击，但是无页面弹出,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449283075/1542449283075_电话号码2.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035414,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:游地区推荐标题显示重复,report_id:10010000035307,create_time_millis:1542362027160,description:1.选择境内游地区为北京
-2.推荐标题显示重复,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449201394/1542449201394_9.png,bug_page:牛人专线-境内游-地区选择,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035413,case_take_id:1490-2614,bug_category:功能不完整,severity:3,recurrent:4,title:后进入页面,report_id:10010000035322,create_time_millis:1542361994090,description:点击牛人初体验的图片后，没有像点击其他图片一样进入页面。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449219859/1542449219859_捕获.PNG,bug_page:牛人专线-周边游,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035379,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:4,recurrent:5,title:牛人专线页面缩放排版错误,report_id:10010000035308,create_time_millis:1542360902780,description:页面缩放后应和原网页排版布局相同，实际上缩放后页面右上侧的吃住升级、行程合理、资深导游、无强制性消费，这个板块会缩在牛专目的地、牛人新品的下面，显示重叠,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447891120/1542447891120_7J7@M]O1$R4}{4()Z8MJ9LQ.png,undefined,bug_page:牛人专线,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035378,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:有部分字体没有显示用户,report_id:10010000035316,create_time_millis:1542360869710,description:在牛专目的地、牛人新品、首付出发中字体显示不全面,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447848335/1542447848335_捕获.PNG,bug_page:牛人专线-热门目的地-牛专目的地,case_id:1490,score:5.0,
-
-10:38:55.410 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619750335393,description:,img_url:,bug_page:,case_id:,
-similarJson:serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035338,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:,report_id:10010000035308,create_time_millis:1542359613050,description:价格区间设为0-0.1，查询结果错误,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446341088/1542446341088_Z]D@AZ7ZOTL4@QHAX8E7(H8.png,undefined,http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446361360/1542446361360_Z]D@AZ7ZOTL4@QHAX8E7(H8.png,bug_page:牛人专线-热门目的地,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035415,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:牛人新品页面中电话号码可,report_id:10010000035317,create_time_millis:1542362060230,description:1、登录途牛旅游网
-2、鼠标悬停至“跟团游”
-3、点击“牛人专线”
-4、点击“牛人新品”
-5、使用谷歌浏览器打开界面进行测试
-6、鼠标移至电话号码处可点击，但是无页面弹出,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449283075/1542449283075_电话号码2.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035378,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:有部分字体没有显示用户,report_id:10010000035316,create_time_millis:1542360869710,description:在牛专目的地、牛人新品、首付出发中字体显示不全面,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447848335/1542447848335_捕获.PNG,bug_page:牛人专线-热门目的地-牛专目的地,case_id:1490,score:5.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:5.0,
-
-10:38:59.259 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619750339251,description:,img_url:,bug_page:,case_id:,
-similarJson:serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035415,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:牛人新品页面中电话号码可,report_id:10010000035317,create_time_millis:1542362060230,description:1、登录途牛旅游网
-2、鼠标悬停至“跟团游”
-3、点击“牛人专线”
-4、点击“牛人新品”
-5、使用谷歌浏览器打开界面进行测试
-6、鼠标移至电话号码处可点击，但是无页面弹出,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449283075/1542449283075_电话号码2.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035357,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:4,recurrent:5,title:进入牛人新品页面出现页面是牛人新品,report_id:10010000035318,create_time_millis:1542360175240,description:进入牛人新品页面出现的页面是牛新品--2,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447084687/1542447084687_QQ截图20181117171413.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035332,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品中点左侧抢购按钮右侧无字符部分无,report_id:10010000035311,create_time_millis:1542359414630,description:进入牛人新品后点击左侧按钮无字符部分无反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446029853/1542446029853_c4bb825350776f838c584e8697d2f08.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-
-10:39:01.612 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:,bug_category:不正常退出,severity:0,recurrent:0,title:,report_id:,create_time_millis:1619750341603,description:,img_url:,bug_page:,case_id:,
-similarJson:serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035415,case_take_id:1490-2614,bug_category:用户体验,severity:3,recurrent:5,title:牛人新品页面中电话号码可,report_id:10010000035317,create_time_millis:1542362060230,description:1、登录途牛旅游网
-2、鼠标悬停至“跟团游”
-3、点击“牛人专线”
-4、点击“牛人新品”
-5、使用谷歌浏览器打开界面进行测试
-6、鼠标移至电话号码处可点击，但是无页面弹出,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449283075/1542449283075_电话号码2.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035357,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:4,recurrent:5,title:进入牛人新品页面出现页面是牛人新品,report_id:10010000035318,create_time_millis:1542360175240,description:进入牛人新品页面出现的页面是牛新品--2,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542447084687/1542447084687_QQ截图20181117171413.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035411,case_take_id:1490-2614,bug_category:功能不完整,severity:4,recurrent:5,title:牛人专线牛人新品右侧黑色显示国家名称椭圆界面错误,report_id:10010000035308,create_time_millis:1542361961020,description:最下面的空白框点不动；且在鼠标放在其他黑色椭圆显示为小手样式，在空白框显示无变化，为鼠标箭头,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542449095199/1542449095199_BYE8ST}9A2)TJYV4{�K6A.jpg,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-serialVersionUID:null,id:10010000035332,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品中点左侧抢购按钮右侧无字符部分无,report_id:10010000035311,create_time_millis:1542359414630,description:进入牛人新品后点击左侧按钮无字符部分无反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446029853/1542446029853_c4bb825350776f838c584e8697d2f08.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:10.0,
-
-10:39:05.833 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:,bug_category:不正常退出,severity:2,recurrent:0,title:,report_id:,create_time_millis:1619750345826,description:,img_url:,bug_page:,case_id:,
-similarJson:serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035332,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品中点左侧抢购按钮右侧无字符部分无,report_id:10010000035311,create_time_millis:1542359414630,description:进入牛人新品后点击左侧按钮无字符部分无反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446029853/1542446029853_c4bb825350776f838c584e8697d2f08.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035382,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品里右侧悬浮栏最后空白悬浮栏会表示选择字,report_id:10010000035342,create_time_millis:1542361001990,description:点击“跟团游”--“牛人专线“--找到”热门目的地“，点击”牛人新品“，进入牛人新品往下拉页面右侧会出现悬浮栏，双击最后一个空白悬浮栏，会选择上一悬浮栏”欧美“二字。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542448068237/1542448068237_微信图片_20181117174650.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035327,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛新品ui界面缺少元素,report_id:10010000035310,create_time_millis:1542359282350,description:页面右侧导航栏缺少相应元素,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542445764239/1542445764239_牛新品.PNG,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035503,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:页面显示缺陷,report_id:10010000035330,create_time_millis:1542368553320,description:在右侧栏中页面显示有缺陷,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542455126947/1542455126947_牛人新品.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-
-10:39:08.216 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:,bug_category:不正常退出,severity:2,recurrent:2,title:,report_id:,create_time_millis:1619750348210,description:,img_url:,bug_page:,case_id:,
-similarJson:serialVersionUID:null,id:10010000035339,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品中右侧地点选择出选项,report_id:10010000035311,create_time_millis:1542359646120,description:进入牛人新品后发现右侧地点选择出现为空的选项,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446291204/1542446291204_286235131c8b1f9a40040f69c005f2e.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035335,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛人新品标题错误,report_id:10010000035313,create_time_millis:1542359513840,description:1、点击“牛人新品”按钮
-2、查看窗口文字标题
-实际结果：窗口文字标题为“牛新品---2”,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446308310/1542446308310_2.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035332,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品中点左侧抢购按钮右侧无字符部分无,report_id:10010000035311,create_time_millis:1542359414630,description:进入牛人新品后点击左侧按钮无字符部分无反应,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542446029853/1542446029853_c4bb825350776f838c584e8697d2f08.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035382,case_take_id:1490-2614,bug_category:用户体验,severity:2,recurrent:5,title:牛人新品里右侧悬浮栏最后空白悬浮栏会表示选择字,report_id:10010000035342,create_time_millis:1542361001990,description:点击“跟团游”--“牛人专线“--找到”热门目的地“，点击”牛人新品“，进入牛人新品往下拉页面右侧会出现悬浮栏，双击最后一个空白悬浮栏，会选择上一悬浮栏”欧美“二字。,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542448068237/1542448068237_微信图片_20181117174650.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035327,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:牛新品ui界面缺少元素,report_id:10010000035310,create_time_millis:1542359282350,description:页面右侧导航栏缺少相应元素,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542445764239/1542445764239_牛新品.PNG,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-serialVersionUID:null,id:10010000035503,case_take_id:1490-2614,bug_category:页面布局缺陷,severity:2,recurrent:5,title:页面显示缺陷,report_id:10010000035330,create_time_millis:1542368553320,description:在右侧栏中页面显示有缺陷,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com/app/1542455126947/1542455126947_牛人新品.png,bug_page:牛人专线-热门目的地-牛人新品,case_id:1490,score:15.0,
-

logs/recommend.log.2021-05-08.log

@@ -1,59 +0,0 @@
-17:32:03.194 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466323189,description:,img_url:,bug_page:首页,case_id:1718,
-similarJson:
-17:32:12.749 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466332748,description:,img_url:,bug_page:首页-众测技术,case_id:1718,
-similarJson:
-17:32:14.022 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466334021,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:15.130 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466335130,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:15.971 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:0,title:,report_id:,create_time_millis:1620466335970,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:16.848 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:,report_id:,create_time_millis:1620466336848,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:20.318 [http-nio-8090-exec-7] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:c,report_id:,create_time_millis:1620466340318,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:21.805 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试r,report_id:,create_time_millis:1620466341805,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:23.107 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620466343107,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:23.303 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620466343303,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:23.805 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620466343805,description:测试任务,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:32:24.940 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620466344939,description:测试任务,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:
-17:33:36.639 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620466416637,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:60.0,
-
-17:33:37.072 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620466417067,description:测试任务,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:100.0,
-
-17:34:36.295 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466476293,description:,img_url:,bug_page:首页,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:5.0,
-
-17:34:46.931 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466486929,description:,img_url:,bug_page:首页,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:5.0,
-
-17:34:47.917 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466487914,description:,img_url:,bug_page:首页-众测技术,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:10.0,
-
-17:34:48.966 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466488965,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:51.139 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620466491139,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:52.306 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:0,title:,report_id:,create_time_millis:1620466492306,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:53.226 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:,report_id:,create_time_millis:1620466493226,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:55.401 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:ce,report_id:,create_time_millis:1620466495400,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:56.882 [http-nio-8090-exec-7] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:ce'sh,report_id:,create_time_millis:1620466496882,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:58.382 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620466498382,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:58.431 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620466498431,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:34:59.384 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620466499384,description:测试一下,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:
-17:35:00.673 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620466500673,description:测试一下,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:

logs/recommend.log.2021-05-09.log

@@ -1,54 +0,0 @@
-10:19:40.684 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620526780681,description:,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:60.0,
-serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:15.0,
-
-10:19:41.162 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:,create_time_millis:1620526781161,description:测试任务,img_url:,bug_page:首页-众测技术-论文专著,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:100.0,
-serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:15.0,
-
-10:19:53.914 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620526793912,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:60.0,
-serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:15.0,
-
-10:19:54.420 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620526794419,description:测试一下,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:100.0,
-serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:15.0,
-
-10:24:37.311 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620527077310,description:,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:60.0,
-serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:15.0,
-
-10:24:37.816 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:,create_time_millis:1620527077815,description:测试一下,img_url:,bug_page:首页-众测技术-技术文章,case_id:1718,
-similarJson:serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:100.0,
-serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:15.0,
-
-10:37:26.367 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620527846364,description:,img_url:,bug_page:首页,case_id:1718,
-similarJson:serialVersionUID:null,id:60965ab3ac945d40c51ebe95,case_take_id:1718-1718,bug_category:功能不完整,severity:1,recurrent:2,title:测试任务,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620466355669,description:测试任务,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466352733/1620466352733_%E8%BA%AB%E4%BB%BD%E8%AF%81.png,bug_page:首页-众测技术-论文专著,case_id:1718,score:5.0,
-serialVersionUID:null,id:6097465bac945d40c51ebe98,case_take_id:1718-1718,bug_category:安全,severity:4,recurrent:3,title:测试一下,report_id:6088bbc56adc0482f34e5a89,create_time_millis:1620526683513,description:测试一下,img_url:http://mooctest-site.oss-cn-shanghai.aliyuncs.com//app/1620466612994/1620466612994_test.jpg,bug_page:首页-众测技术-技术文章,case_id:1718,score:5.0,
-
-10:37:28.308 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620527848308,description:,img_url:,bug_page:首页-个人中心,case_id:1718,
-similarJson:
-10:37:29.235 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620527849235,description:,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:30.370 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:0,recurrent:0,title:,report_id:,create_time_millis:1620527850370,description:,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:31.303 [http-nio-8090-exec-1] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:0,title:,report_id:,create_time_millis:1620527851303,description:,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:32.243 [http-nio-8090-exec-3] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:,report_id:,create_time_millis:1620527852243,description:,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:34.624 [http-nio-8090-exec-4] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:1718测试用例二,report_id:,create_time_millis:1620527854624,description:,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:35.061 [http-nio-8090-exec-5] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:1718测试用例二,report_id:,create_time_millis:1620527855061,description:,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:36.119 [http-nio-8090-exec-7] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:1718测试用例二,report_id:,create_time_millis:1620527856119,description:1718测试用例二,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:38.119 [http-nio-8090-exec-6] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:1718测试用例二,report_id:,create_time_millis:1620527858119,description:1718测试用例二信息,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:38.575 [http-nio-8090-exec-8] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:1718测试用例二,report_id:,create_time_millis:1620527858574,description:1718测试用例二信息,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:39.122 [http-nio-8090-exec-10] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:b1718测试用例二,report_id:,create_time_millis:1620527859122,description:1718测试用例二信息,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:40.619 [http-nio-8090-exec-9] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:bug1718测试用例二,report_id:,create_time_millis:1620527860619,description:1718测试用例二信息,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:
-10:37:42.468 [http-nio-8090-exec-2] INFO  e.n.s.RecommendService - userJson:serialVersionUID:null,id:null,case_take_id:1718-1718,bug_category:用户体验,severity:3,recurrent:3,title:bug1718测试用例二,report_id:,create_time_millis:1620527862468,description:1718测试用例二信息,img_url:,bug_page:首页-个人中心-我的银行卡,case_id:1718,
-similarJson:

src/main/java/edu/nju/controller/ExtraController.java

@@ -14,6 +14,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.json.JSONArray;
 import org.json.JSONObject;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.*;
 
@@ -34,9 +35,19 @@ import java.net.URLConnection;
 @RequestMapping(value = "/extra")
 @CrossOrigin(origins = "*", maxAge = 3600, allowCredentials = "true")
 public class ExtraController {
+
 	@Autowired
 	ExtraService extraService;
 
+	@Value("${save.path}")
+	private String savePath;
+
+	@Value("${save.folder}")
+	private String folderName;
+
+	@Value("${save.download}")
+	private String downloadPath;
+
 	/**
 	 * 上传测试报告   /uploadReport  返回测试报告id
 	 * @param case_id   用例id
@@ -245,7 +256,7 @@ public class ExtraController {
 	public String uploadExam(@RequestParam("file") MultipartFile file, String file_name, String paper_type,
 							     String case_id, String test_type, String description, String app_name) {
 		try {
-			File dest = new File("/Users/guochao/Downloads/" + file_name);
+			File dest = new File(savePath + folderName + downloadPath + "/" + file_name);
 			if(!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); }
 			if(!file.isEmpty()) { file.transferTo(dest); }
 			String json = extraService.saveExam(case_id, dest.getPath(), app_name, paper_type, test_type, description, CollaborativeType.IS_COLLABORATIVE.getId()+"");
@@ -276,48 +287,56 @@ public class ExtraController {
 		try {
 			System.out.println("file " + file);
 			System.out.println("file_name " + file_name);
-			File dest = new File("/Users/guochao/Downloads/" + file_name);
-			if(!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); }
-			//从oss下载文件
-			// 统一资源
-			URL url = new URL(file);
-			// 连接类的父类，抽象类
-			URLConnection urlConnection = url.openConnection();
-			// http的连接类
-			HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
-			//设置超时
-			httpURLConnection.setConnectTimeout(1000*5);
-			//设置请求方式，默认是GET
-//          httpURLConnection.setRequestMethod("GET");
-			// 设置字符编码
-			httpURLConnection.setRequestProperty("Charset", "UTF-8");
-			// 打开到此 URL引用的资源的通信链接（如果尚未建立这样的连接）。
-			httpURLConnection.connect();
-			// 文件大小
-			int fileLength = httpURLConnection.getContentLength();
-
-			// 建立链接从请求中获取数据
-			URLConnection con = url.openConnection();
-			BufferedInputStream bin = new BufferedInputStream(httpURLConnection.getInputStream());
-			// 指定文件名称(有需求可以自定义)
-			// 指定存放位置(有需求可以自定义)
-
-
-			OutputStream out = new FileOutputStream(dest);
-			int size = 0;
-			int len = 0;
-			byte[] buf = new byte[2048];
-			while ((size = bin.read(buf)) != -1) {
-				len += size;
-				out.write(buf, 0, size);
+			File dest;
+			if(file.contains("http://")){
+				// oss的链接，进行将excel文件下载到本地，然后进行解析
+				dest = new File(savePath + folderName + downloadPath + "/" + file_name);
+				if(!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); }
+				//从oss下载文件
+				// 统一资源
+				URL url = new URL(file);
+				// 连接类的父类，抽象类
+				URLConnection urlConnection = url.openConnection();
+				// http的连接类
+				HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
+				//设置超时
+				httpURLConnection.setConnectTimeout(1000*5);
+				//设置请求方式，默认是GET
+	//          httpURLConnection.setRequestMethod("GET");
+				// 设置字符编码
+				httpURLConnection.setRequestProperty("Charset", "UTF-8");
+				// 打开到此 URL引用的资源的通信链接（如果尚未建立这样的连接）。
+				httpURLConnection.connect();
+				// 文件大小
+				int fileLength = httpURLConnection.getContentLength();
+
+				// 建立链接从请求中获取数据
+				URLConnection con = url.openConnection();
+				BufferedInputStream bin = new BufferedInputStream(httpURLConnection.getInputStream());
+				// 指定文件名称(有需求可以自定义)
+				// 指定存放位置(有需求可以自定义)
+
+
+				OutputStream out = new FileOutputStream(dest);
+				int size = 0;
+				int len = 0;
+				byte[] buf = new byte[2048];
+				while ((size = bin.read(buf)) != -1) {
+					len += size;
+					out.write(buf, 0, size);
+				}
+				// 关闭资源
+				bin.close();
+				out.close();
+			}else{
+				// 私有云，文件就在本地，直接获取即可
+				dest = new File(file);
 			}
-			// 关闭资源
-			bin.close();
-			out.close();
+			System.out.println("dest_file " + dest.getPath());
+
 			if(collaborative_type == null || collaborative_type == ""){
 				collaborative_type = CollaborativeType.IS_COLLABORATIVE.getId() + "";
 			}
-			System.out.println(dest.getPath());
 			String json = extraService.saveExam(case_id, dest.getPath(), app_name, paper_type, test_type, description, collaborative_type);
 			return json;
 		} catch (IOException e) {
@@ -333,7 +352,7 @@ public class ExtraController {
 //								String if_test_case,String if_bug) {
 //		try {
 //
-//			File dest = new File("/Users/guochao/Downloads/" + file_name);
+//			File dest = new File(downloadPath + file_name);
 //			if(!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); }
 //			//从oss下载文件
 //			// 统一资源

src/main/java/edu/nju/controller/UploadController.java

@@ -278,7 +278,7 @@ public class UploadController {
 	@ResponseBody
 	public String uploadImage(MultipartFile file, String caseId, String work_id){
 		String uploadImage = uploadService.uploadImage(file, caseId, work_id);
-		System.out.println(uploadImage);
+		System.out.println("图片上传：" + uploadImage);
 		return uploadImage;
 	}
 }

src/main/java/edu/nju/model/enums/UploadType.java

@@ -1,8 +0,0 @@
-package edu.nju.model.enums;
-
-/**
- * @说明: 上传文件的类型表示，与OSS中的文件夹相对应
- */
-public class UploadType {
-    public static final String IMAGE = "image/";
-}

src/main/java/edu/nju/service/ExtraService.java

@@ -115,6 +115,7 @@ public class ExtraService {
 	
 	//测试题目相关
 	public String saveExam(String case_id, String path, String app_name, String paper_type, String test_type, String description, String collaborative_type) {
+		// 将excel文件下载到本地，然后进行解析
 		String json = ExcelToJson.ExcelTranse(path).toString();
 		Exam exam = new Exam(case_id, json, app_name, paper_type, test_type, description, collaborative_type);
 		examDao.save(exam);

src/main/java/edu/nju/service/GuideService.java

@@ -1,5 +1,6 @@
 package edu.nju.service;
 
+import java.io.*;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -15,6 +16,7 @@ import edu.nju.util.HTTP;
 import org.json.JSONArray;
 import org.json.JSONObject;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 
 import edu.nju.entities.BugMirror;
@@ -30,7 +32,19 @@ public class GuideService {
 	
 	@Autowired
 	ReportService rservice;
-	
+
+	@Value("${useOss}")
+	boolean useOss;
+
+	@Value("${save.path}")
+	private String savePath;
+
+	@Value("${save.folder}")
+	private String folderName;
+
+	@Value("${save.json}")
+	private String jsonName;
+
 	//用户二分类，0为审查，1为提交
 	public int UserClassify(String report_id, String case_take_id) {
 		List<List<String>> relations = drService.getAllRelation(case_take_id, report_id);
@@ -54,11 +68,36 @@ public class GuideService {
 		String QS = case_id[0];
 		String structure = "";
 		if(session.getAttribute(QS) == null) {
-			structure = HTTP.sendGet("http://mooctest-site.oss-cn-shanghai.aliyuncs.com/json/" + QS + ".json" , "");
+			if(useOss){
+				structure = HTTP.sendGet("http://mooctest-site.oss-cn-shanghai.aliyuncs.com/json/" + QS + ".json" , "");
+			}else{
+				// 私有云使用本地的json文件
+				String jsonFilePath = savePath + folderName + jsonName + "/" + QS + ".json";
+				System.out.println("使用本地文件：" + jsonFilePath + " 获取json内容");
+				StringBuilder result = new StringBuilder();
+				try {
+					// 读取文件内容
+					InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(jsonFilePath), "UTF-8");
+					BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
+					String line = null;
+					while((line = bufferedReader.readLine()) != null){
+						result.append(System.lineSeparator() + line);
+					}
+					inputStreamReader.close();
+					structure = result.toString();
+				} catch (UnsupportedEncodingException e) {
+					e.printStackTrace();
+				} catch (FileNotFoundException e) {
+					e.printStackTrace();
+				} catch (IOException e){
+					e.printStackTrace();
+				}
+			}
+
 		} else {
 			structure = session.getAttribute(QS).toString();
 		}
-		System.out.println(structure);
+//		System.out.println(structure);
 		if(structure.equals("")) { return ""; }
 		return jsonGet(structure, getPages(rservice.getUserPath(report_id, case_take_id)), getPages(aservice.getBugDetail(case_take_id)));
 	}

src/main/java/edu/nju/service/NginxFileService.java

@@ -2,7 +2,6 @@ package edu.nju.service;
 
 import edu.nju.entities.BugDetail;
 import edu.nju.entities.Exam;
-import edu.nju.model.enums.UploadType;
 import edu.nju.util.FileUtil;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 
@@ -10,10 +9,8 @@ import java.io.File;
 import java.util.List;
 
 import com.alibaba.fastjson.JSON;
-import com.aliyun.oss.OSS;
 import edu.nju.dao.*;
 import edu.nju.entities.*;
-import edu.nju.util.OssAliyun;
 import edu.nju.util.TransUtil;
 import org.json.JSONArray;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -23,9 +20,6 @@ import org.springframework.web.multipart.MultipartFile;
 
 import java.io.*;
 import java.lang.reflect.Field;
-import java.net.HttpURLConnection;
-import java.net.URL;
-import java.net.URLConnection;
 import java.nio.charset.StandardCharsets;
 import java.util.*;
 import java.util.zip.ZipEntry;
@@ -84,6 +78,9 @@ public class NginxFileService implements FileService {
     @Value("${save.output}")
     private String outputName;
 
+    @Value("${save.image}")
+    private String imagePath;
+
     @Override
     public void uploadImage() {
 
@@ -287,7 +284,7 @@ public class NginxFileService implements FileService {
         exportCsv(titles, bugDetailList, caseId);
         exportJson(bugDetailList, caseId);
         //导出图片zip包
-        String sourceFile = savePath + folderName + "/" + UploadType.IMAGE + caseId;
+        String sourceFile = savePath + folderName + imagePath + "/" + caseId;
         try {
             File dest = new File(savePath + folderName + outputName + "/imageZip/" + caseId + ".zip");
             if (!dest.getParentFile().exists()) {

src/main/java/edu/nju/service/OssFileService.java

@@ -6,7 +6,6 @@ import com.aliyun.oss.OSSException;
 import com.aliyun.oss.model.*;
 import edu.nju.configuration.OSSConfiguration;
 import edu.nju.entities.BugDetail;
-import edu.nju.model.enums.UploadType;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.web.multipart.MultipartFile;
@@ -101,6 +100,9 @@ public class OssFileService implements FileService {
 	@Value("${save.folder}")
 	private String folderName;
 
+	@Value("${save.image}")
+	private String imagePath;
+
 	@Value("${save.input}")
 	private String inputName;
 
@@ -439,7 +441,7 @@ public class OssFileService implements FileService {
 					if(!"".equals(imageUrl)) {
 						String[] filePath = imageUrlStr.split("/");
 						String fileName = filePath[filePath.length - 1];
-						String newImageUrl = ossConfig.getBaseUrl() + folderName + "/" + UploadType.IMAGE + originalCaseId + "/" + cpSerialNum + "/" + fileName;
+						String newImageUrl = ossConfig.getBaseUrl() + folderName + imagePath + "/" + originalCaseId + "/" + cpSerialNum + "/" + fileName;
 						stringBuilder.append(newImageUrl).append(",");
 					}
 				}

src/main/java/edu/nju/service/UploadServiceImpl.java

@@ -1,6 +1,5 @@
 package edu.nju.service;
 
-import edu.nju.model.enums.UploadType;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
@@ -20,9 +19,12 @@ public class UploadServiceImpl implements UploadService {
 	@Value("${save.input}")
 	private String inputName;
 
+	@Value("${save.image}")
+	private String imagePath;
+
 	@Override
 	public String uploadImage(MultipartFile file, String caseId, String work_id) {
-		String fileName = folderName.substring(1) + "/" + UploadType.IMAGE + caseId +"/"+ work_id +"_"+System.currentTimeMillis()+""
+		String fileName = folderName.substring(1) + imagePath + "/" + caseId +"/"+ work_id +"_"+System.currentTimeMillis()+""
 				+file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."), file.getOriginalFilename().length());
 		return doUpload(fileName, caseId, file);
 	}

src/main/resources/application.yml

@@ -1,9 +1,6 @@
 #spring.profiles.active: dev-xc
-#spring.profiles.active: private
-spring.profiles.active: dev-online
-#spring.profiles.active: dev
-#spring.profiles.active: test
-#spring.profiles.active: prod
+spring.profiles.active: private
+#spring.profiles.active: dev-online
 
 cpSerialNum: cp_mooctest_dev
 
@@ -16,7 +13,7 @@ thirdPartTool:
     host: mooctest.net
     port: 80
     path: ""
-sanjiPageUrl: "changeThis"
+sanjiPageUrl: https://mooctest-site.oss-cn-shanghai.aliyuncs.com/xinchuang/
 
 oss:
   accessKeyId: LTAI4FdrT3HsfdR5edBVN7ws
@@ -64,8 +61,12 @@ save:
   folder: /xinchuang
   input: /input
   output: /output
+  download: /downloads
+  json: /json
+  image: /image
 main:
   site: http://127.0.0.1:8080
+
 ---
 spring:
   profiles: private
@@ -89,4 +90,10 @@ save:
   path: /Users/guochao/Desktop/corwd-file
   folder: /xinchuang
   input: /input
-  output: /output
+  output: /output
+  download: /downloads
+  json: /json
+  image: /image
+main:
+#  site: http://139.224.0.118
+  site: http://127.0.0.1:8080

src/main/resources/bootstrap.yml

@@ -5,7 +5,7 @@ spring:
     name: mooctest-crowdsource-backend
   cloud:
     zookeeper:
-      enabled: true  # true:开启zookeeper外部化配置, false:读取本地配置;
+      enabled: false  # true:开启zookeeper外部化配置, false:读取本地配置;
       connect-string: 101.37.175.111:2181
       config:
         root: /config