Kafka 消费者尝试加入 Kafka 消费者组，但突然退出消费者组。
Kafka broker 日志确认该成员已加入群组。
[2021-06-25 19:47:25,612] INFO [GroupCoordinator 1002]: Preparing to rebalance group ABCDSTREAM in state PreparingRebalance with old generation 8 (__consumer_offsets-42) (reason: Adding new member ABCDSTREAM-7480b34a-6e44-4fdc-87ab-71655b9490f0-StreamThread-1-consumer-c75b5014-e853-4b7e-943b-f9873b5e061d with group instanceid None) (kafka.coordinator.group.GroupCoordinator)
[2021-06-25 19:47:25,613] INFO [GroupCoordinator 1002]: Stabilized group ABCDSTREAM generation 9 (__consumer_offsets-42) (kafka.coordinator.group.GroupCoordinator)
[2021-06-25 19:47:25,701] INFO [GroupCoordinator 1002]: Assignment received from leader for group ABCDSTREAMfor generation 9 (kafka.coordinator.group.GroupCoordinator)
但就在半分钟后，broker 日志显示由于心跳异常，消费者正在离开组。
[2021-06-25 19:47:41,859] INFO [GroupCoordinator 1002]: Member ABCDSTREAM-7480b34a-6e44-4fdc-87ab-71655b9490f0-StreamThread-1-consumer-c75b5014-e853-4b7e-943b-f9873b5e061d in group ABCDSTREAM has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
[2021-06-25 19:47:41,859] INFO [GroupCoordinator 1002]: Preparing to rebalance group ABCDSTREAM in state PreparingRebalance with old generation 9 (__consumer_offsets-42) (reason: removing member ABCDSTREAM-7480b34a-6e44-4fdc-87ab-71655b9490f0-StreamThread-1-consumer-c75b5014-e853-4b7e-943b-f9873b5e061d on heartbeat expiration) (kafka.coordinator.group.GroupCoordinator)
[2021-06-25 19:47:41,859] INFO [GroupCoordinator 1002]: Group ABCDSTREAM with generation 10 is now empty (__consumer_offsets-42) (kafka.coordinator.group.GroupCoordinator)
流应用程序日志中发生以下事件：
<块引用>从 CREATED 到 REBALANCING 的状态转换
从 CREATED 到 STARTING 的状态转换
订阅主题和分区作业
第 13 代完成小组作业
13代成功加入群组
从 STARTING 到 PARTITIONS_ASSIGNED 的状态转换
流应用程序日志没有显示任何行为，因为它被踢出代理中的消费者组。
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