[jira] [Created] (KAFKA-4593) Task migration during rebalance callback process could lead the obsoleted task's IllegalStateException

["Guozhang Wang (JIRA)" <ji...@apache.org>]

Guozhang Wang created KAFKA-4593:
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             Summary: Task migration during rebalance callback process could lead the obsoleted task's IllegalStateException
                 Key: KAFKA-4593
                 URL: https://issues.apache.org/jira/browse/KAFKA-4593
             Project: Kafka
          Issue Type: Bug
          Components: streams
            Reporter: Guozhang Wang


1. Assume 2 running threads A and B, and one task t1 jut for simplicity.
2. First rebalance is triggered, task t1 is assigned to A (B has no assigned task).
3. During the first rebalance callback, task t1's state store need to be restored on thread A, and this is called in "restoreActiveState" of "createStreamTask".
4. Not suppose thread A has a long GC causing it to stall, a second rebalance then will be triggered and kicked A out of the group; B gets the task t1 and did the same restoration process, after the process thread B continues to process data and update the state store, while at the same time writes more messages to the changelog (so its log end offset has incremented).

5. After a while A resumes from the long GC, not knowing it has actually be kicked out of the group and task t1 is no longer owned to itself, it continues the restoration process but then realize that the log end offset has advanced. When this happens, we will see the following exception on thread A:

{code}
java.lang.IllegalStateException: task XXX Log end offset of
YYY-table_stream-changelog-ZZ should not change while
restoring: old end offset .., current offset ..

        at
org.apache.kafka.streams.processor.internals.ProcessorStateManager.restoreActiveState(ProcessorStateManager.java:248)

        at
org.apache.kafka.streams.processor.internals.ProcessorStateManager.register(ProcessorStateManager.java:201)

        at
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.register(ProcessorContextImpl.java:122)

        at
org.apache.kafka.streams.state.internals.RocksDBWindowStore.init(RocksDBWindowStore.java:200)

        at
org.apache.kafka.streams.state.internals.MeteredWindowStore.init(MeteredWindowStore.java:65)

        at
org.apache.kafka.streams.state.internals.CachingWindowStore.init(CachingWindowStore.java:65)

        at
org.apache.kafka.streams.processor.internals.AbstractTask.initializeStateStores(AbstractTask.java:86)

        at
org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:120)

        at
org.apache.kafka.streams.processor.internals.StreamThread.createStreamTask(StreamThread.java:794)

        at
org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:1222)

        at
org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.retryWithBackoff(StreamThread.java:1195)

        at
org.apache.kafka.streams.processor.internals.StreamThread.addStreamTasks(StreamThread.java:897)

        at
org.apache.kafka.streams.processor.internals.StreamThread.access$500(StreamThread.java:71)

        at
org.apache.kafka.streams.processor.internals.StreamThread$1.onPartitionsAssigned(StreamThread.java:240)

        at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:230)

        at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:314)

        at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:278)

        at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:261)

        at
org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1039)

        at
org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1004)

        at
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:570)

        at
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:359)
{code}



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