我正在尝试使用在我的组织中预先编写的kafka使用者库。它从Kafka主题获取JSON数据，并将其存储在Mongo数据库中。虽然我无法发布此代码，但它是一个非常简单的体系结构，它使用Apache Camel路由，然后使用Springboot Mongo依赖项将消耗的消息存储到Mongo中。
我遇到一种情况，当部署到OpenShift并按比例扩展一个以上的pod时，收到以下异常，然后该应用程序挂起而没有任何其他输入或处理。我相信失败是在kafka客户端库中的逻辑内发生的。
我尝试在本地使用不同端口运行该应用程序的两个实例。完美无误。我尝试设置心跳间隔，会话超时，批处理大小，最大读取字节，并发使用者数，SEDA模式打开/关闭以及请求超时。向上，向下，打开，关闭和未定义更改这些Kafka设置，问题仍然存在。
2019-05-23 16:15:51 [Camel (camel-1) thread #1 - KafkaConsumer[mytopic]] ERROR o.a.k.c.c.i.ConsumerCoordinator - Error UNKNOWN_MEMBER_ID occurred while committing offsets for group mytopic-status
2019-05-23 16:15:51 [Camel (camel-1) thread #7 - KafkaConsumer[mytopic]] ERROR o.a.k.c.c.i.ConsumerCoordinator - Error UNKNOWN_MEMBER_ID occurred while committing offsets for group mytopic-status
2019-05-23 16:15:51 [Camel (camel-1) thread #7 - KafkaConsumer[mytopic]] WARN o.a.c.component.kafka.KafkaConsumer - Error consuming mytopic-Thread 0 from kafka topic. Caused by: [org.apache.kafka.clients.consumer.CommitFailedException - Commit cannot be completed due to group rebalance]
org.apache.kafka.clients.consumer.CommitFailedException: Commit cannot be completed due to group rebalance
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator$OffsetCommitResponseHandler.handle(ConsumerCoordinator.java:552)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator$OffsetCommitResponseHandler.handle(ConsumerCoordinator.java:493)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator$CoordinatorResponseHandler.onSuccess(AbstractCoordinator.java:665)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator$CoordinatorResponseHandler.onSuccess(AbstractCoordinator.java:644)
at org.apache.kafka.clients.consumer.internals.RequestFuture$1.onSuccess(RequestFuture.java:167)
at org.apache.kafka.clients.consumer.internals.RequestFuture.fireSuccess(RequestFuture.java:133)
at org.apache.kafka.clients.consumer.internals.RequestFuture.complete(RequestFuture.java:107)
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient$RequestFutureCompletionHandler.onComplete(ConsumerNetworkClient.java:380)
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:274)
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.clientPoll(ConsumerNetworkClient.java:320)
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:213)
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:193)
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:163)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.commitOffsetsSync(ConsumerCoordinator.java:358)
at org.apache.kafka.clients.consumer.KafkaConsumer.commitSync(KafkaConsumer.java:968)
at org.apache.kafka.clients.consumer.KafkaConsumer.commitSync(KafkaConsumer.java:936)
at org.apache.camel.component.kafka.KafkaConsumer$KafkaFetchRecords.run(KafkaConsumer.java:132)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
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