def describe(self, node_id, group_name):
    describe_groups_request = admin.DescribeGroupsRequest_v0(
        groups=[(group_name)]
    )
    future = self.client.send(node_id, describe_groups_request)
    self.client.poll(timeout_ms=self.timeout, future=future)

    (error_code, group_id, state, protocol_type, protocol, members) = future.value.groups[0]

    if error_code != 0:
        print(
            "Kafka API - RET admin.DescribeGroupsRequest, error_code={}, group_id={}, state={}, protocol_type={}, protocol={}, members_count={}".format(
                error_code, group_id, state, protocol_type, protocol, len(members)))
        exit(1)

    metadata_consumer_group = {'id': group_name, 'state': state, 'topics': [], 'lag': 0, 'members': []}

    if len(members) != 0:
        for member in members:
            (member_id, client_id, client_host, member_metadata, member_assignment) = member
            member_topics_assignment = []
            for (topic, partitions) in MemberAssignment.decode(member_assignment).assignment:
                member_topics_assignment.append(topic)

            metadata_consumer_group['members'].append(
                {'member_id': member_id, 'client_id': client_id, 'client_host': client_host,
                 'topic': member_topics_assignment})

            metadata_consumer_group['topics'] += member_topics_assignment
            (lag_total, topics_found) = self.get_lag_by_topic_list(group_name,
                                                                   topics=metadata_consumer_group['topics'])
            metadata_consumer_group['lag'] = metadata_consumer_group['lag'] + lag_total
    else:
        all_topics = self.client.cluster.topics()

        while '__consumer_offsets' in all_topics: all_topics.remove('__consumer_offsets')
        (lag_total, topics_found) = self.get_lag_by_topic_list(group_name, topics=all_topics)

        metadata_consumer_group['lag'] = metadata_consumer_group['lag'] + lag_total
        metadata_consumer_group['topics'] = topics_found

    return metadata_consumer_group