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https://issues.apache.org/jira/browse/KAFKA-5882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418106#comment-16418106
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Matthias J. Sax commented on KAFKA-5882:
----------------------------------------
Changing the structure of the topology is not a compatible change. Are you
doing rolling-bounce upgrades? For this case, a failure is expected. You would
need to put the whole application offline (ie, shut down all old instances) and
then redeploy the new applications. For this offline upgrade, it should work.
Or do you see the NPE if you do an offline upgrade?
> 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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