我有一个同时具有kafka-streams和kafka-clients 2.4.0的Kafka流媒体应用程序 具有以下配置
properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, brokers);
properties.put(StreamsConfig.PROCESSING_GUARANTEE_CONFIG, StreamsConfig.EXACTLY_ONCE);
场景1 ：我仅启动2个代理（代理IP设置中，流应用仍然包含3个代理IP），当我启动流应用时，会发生以下错误。
2020-02-13 13:28:19.711 WARN 18756 --- [-1-0_0-producer] org.apache.kafka.clients.NetworkClient : [Producer clientId=my-app1-a4c8867f-b914-49bb-bc58-203349700828-StreamThread-1-0_0-producer, transactionalId=my-app1-0_0] Connection to node -2 (/ip2:port2) could not be established. Broker may not be available.
以及1分钟后
org.apache.kafka.streams.errors.StreamsException: stream-thread [my-app1-a4c8867f-b914-49bb-bc58-203349700828-StreamThread-1] Failed to rebalance.
at org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:852)
at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:743)
at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:698)
at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:671)
Caused by: org.apache.kafka.streams.errors.StreamsException: stream-thread [my-app1-a4c8867f-b914-49bb-bc58-203349700828-StreamThread-1] task [0_0] Failed to initialize task 0_0 due to timeout.
at org.apache.kafka.streams.processor.internals.StreamTask.initializeTransactions(StreamTask.java:966)
at org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:254)
at org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:176)
at org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:355)
at org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:313)
at org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.createTasks(StreamThread.java:298)
at org.apache.kafka.streams.processor.internals.TaskManager.addNewActiveTasks(TaskManager.java:160)
at org.apache.kafka.streams.processor.internals.TaskManager.createTasks(TaskManager.java:120)
at org.apache.kafka.streams.processor.internals.StreamsRebalanceListener.onPartitionsAssigned(StreamsRebalanceListener.java:77)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.invokePartitionsAssigned(ConsumerCoordinator.java:272)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:400)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:421)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:340)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:471)
at org.apache.kafka.clients.consumer.KafkaConsumer.updateAssignmentMetadataIfNeeded(KafkaConsumer.java:1267)
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1231)
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1211)
at org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:843)
... 3 common frames omitted
Caused by: org.apache.kafka.common.errors.TimeoutException: Timeout expired after 60000milliseconds while awaiting InitProducerId
我正在测试高可用性测试方案。我认为kafka应该仍然可以正常工作，因为两个代理中正确存在复制（我已经使用kafka GUI工具进行了检查）。
方案2 ：今天，我注意到当我仅启动2个代理并将这些ip赋予两个代理时（即流应用仅具有两个工作代理的ip）
2020-02-16 16:18:24.818 INFO 5741 --- [-StreamThread-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=my-app-0a357371-525b-46cf-9fe1-34ee94fa4158-StreamThread-1-consumer, groupId=my-app] Group coordinator ip2:port2 (id: 2147483644 rack: null) is unavailable or invalid, will attempt rediscovery
2020-02-16 16:18:24.818 ERROR 5741 --- [-StreamThread-1] o.a.k.s.p.internals.StreamThread : stream-thread [my-app-0a357371-525b-46cf-9fe1-34ee94fa4158-StreamThread-1] Encountered the following unexpected Kafka exception during processing, this usually indicate Streams internal errors:
org.apache.kafka.streams.errors.StreamsException: stream-thread [my-app-0a357371-525b-46cf-9fe1-34ee94fa4158-StreamThread-1] Failed to rebalance.
at org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:852)
at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:743)
at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:698)
at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:671)
Caused by: org.apache.kafka.streams.errors.StreamsException: stream-thread [my-app-0a357371-525b-46cf-9fe1-34ee94fa4158-StreamThread-1] task [0_0] Failed to initialize task 0_0 due to timeout.
at org.apache.kafka.streams.processor.internals.StreamTask.initializeTransactions(StreamTask.java:966)
at org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:254)
at org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:176)
at org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:355)
at org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:313)
at org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.createTasks(StreamThread.java:298)
at org.apache.kafka.streams.processor.internals.TaskManager.addNewActiveTasks(TaskManager.java:160)
at org.apache.kafka.streams.processor.internals.TaskManager.createTasks(TaskManager.java:120)
at org.apache.kafka.streams.processor.internals.StreamsRebalanceListener.onPartitionsAssigned(StreamsRebalanceListener.java:77)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.invokePartitionsAssigned(ConsumerCoordinator.java:272)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:400)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:421)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:340)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:471)
at org.apache.kafka.clients.consumer.KafkaConsumer.updateAssignmentMetadataIfNeeded(KafkaConsumer.java:1267)
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1231)
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1211)
at org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:843)
... 3 common frames omitted
Caused by: org.apache.kafka.common.errors.TimeoutException: Timeout expired after 60000milliseconds while awaiting InitProducerId
注意：如果我没有在属性中设置 EXACTLY_ONCE ，则情况并非如此。它们按预期工作。 尝试增加联系并退回最大毫秒数，但没有帮助。 谁能解释我所缺少的吗？
经纪人1停机时经纪人2的日志：
[2020-02-17 02:29:00,302] INFO [ReplicaFetcher replicaId=1, leaderId=3, fetcherId=0] Retrying leaderEpoch request for partition __consumer_offsets-36 as the leader reported an error: UNKNOWN_LEADER_EPOCH (kafka.server.ReplicaFetcherThread)
Kafak日志用上面的行填充。
现在有一项主要观察： 当我关闭broker2（即代理1和代理3正在运行）时，我的流应用程序运行正常。 仅当代理1关闭时，我的应用才会关闭。我猜应该在所有代理之间分发的一些关键信息仅保存在代理1中。