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https://issues.apache.org/jira/browse/KAFKA-5882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16345235#comment-16345235
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Seweryn Habdank-Wojewodzki edited comment on KAFKA-5882 at 1/30/18 3:36 PM:
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One more comment when it happens quite deterministic. When process _*A*_, which
consumes messages from topic _input_ is already running many days and it is
stopped while process _*B*_, which is consuming the same topic also is working
many days, and then by starting again _*A*_ this error comes over and over
again.
Current workaround is to stop both processes and start them again, that makes
reballancing to be passed and no "null" exception is comming. It seems like
some long term state is already deleted from topics, but it is hold in
processes/borker and the new process, which is starting becomes some state with
deleted items.
was (Author: habdank):
One more comment when it happens quite deterministic. When process _*A*_, which
consumes messages from topic _input _is already running many days and it is
stopped while process _*B*_, which is consuming the same topic also is working
many days, and then by starting again _*A*_ this error comes over and over
again.
Current workaround is to stop both processes and start them again, that makes
reballancing to be passed and no "null" exception is comming. It seems like
some long term state is already deleted from topics, but it is hold in
processes/borker and the new process, which is starting becomes some state with
deleted items.
> NullPointerException in StreamTask
> ----------------------------------
>
> Key: KAFKA-5882
> URL: https://issues.apache.org/jira/browse/KAFKA-5882
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.11.0.0, 0.11.0.1, 0.11.0.2
> Reporter: Seweryn Habdank-Wojewodzki
> Priority: Major
>
> It seems bugfix [KAFKA-5073|https://issues.apache.org/jira/browse/KAFKA-5073]
> is made, but introduce some other issue.
> In some cases (I am not sure which ones) I got NPE (below).
> I would expect that even in case of FATAL error anythink except NPE is thrown.
> {code}
> 2017-09-12 23:34:54 ERROR ConsumerCoordinator:269 - User provided listener
> org.apache.kafka.streams.processor.internals.StreamThread$RebalanceListener
> for group streamer failed on partition assignment
> java.lang.NullPointerException: null
> at
> org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:123)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.createStreamTask(StreamThread.java:1234)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:294)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.retryWithBackoff(StreamThread.java:254)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.addStreamTasks(StreamThread.java:1313)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.access$1100(StreamThread.java:73)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread$RebalanceListener.onPartitionsAssigned(StreamThread.java:183)
> ~[myapp-streamer.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:265)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:363)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:310)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:297)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1078)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1043)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:582)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:553)
> [myapp-streamer.jar:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:527)
> [myapp-streamer.jar:?]
> 2017-09-12 23:34:54 INFO StreamThread:1040 - stream-thread
> [streamer-3a44578b-faa8-4b5b-bbeb-7a7f04639563-StreamThread-1] Shutting down
> 2017-09-12 23:34:54 INFO KafkaProducer:972 - Closing the Kafka producer with
> timeoutMillis = 9223372036854775807 ms.
> {code}
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