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Posted to dev@kafka.apache.org by "Damian Guy (JIRA)" <ji...@apache.org> on 2016/12/14 12:26:58 UTC

[jira] [Created] (KAFKA-4539) NPE in StreamThread when creating StandbyTasks

Damian Guy created KAFKA-4539:
---------------------------------

             Summary: NPE in StreamThread when creating StandbyTasks
                 Key: KAFKA-4539
                 URL: https://issues.apache.org/jira/browse/KAFKA-4539
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 0.10.2.0
            Reporter: Damian Guy
            Assignee: Damian Guy
             Fix For: 0.10.2.0


Fails because {{createStandbyTask(..)}} can return null fi the topology for the {{TaskId}} doesn't have any state stores.

{code}
[2016-12-14 12:20:29,758] ERROR [StreamThread-1] User provided listener org.apache.kafka.streams.processor.internals.StreamThread$1 for group kafka-music-charts failed on partition assignment (org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
java.lang.NullPointerException
	at org.apache.kafka.streams.processor.internals.StreamThread$StandbyTaskCreator.createTask(StreamThread.java:1241)
	at org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.retryWithBackoff(StreamThread.java:1188)
	at org.apache.kafka.streams.processor.internals.StreamThread.addStandbyTasks(StreamThread.java:915)
	at org.apache.kafka.streams.processor.internals.StreamThread.access$400(StreamThread.java:72)
	at org.apache.kafka.streams.processor.internals.StreamThread$1.onPartitionsAssigned(StreamThread.java:239)
	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:1022)
	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:987)
	at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:568)
	at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:357)
{code}



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