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https://issues.apache.org/jira/browse/KAFKA-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15753082#comment-15753082
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ASF GitHub Bot commented on KAFKA-4539:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/2255
> StreamThread is not correctly 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 if 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}
> Also fails because the checkpointedOffsets from the newly created
> {{StandbyTask}} aren't added to the offsets map, so the partitions don't get
> assigned. We then get:
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