[jira] [Commented] (KAFKA-4131) Multiple Regex KStream-Consumers cause Null pointer exception in addRawRecords in RecordQueue class

["Bill Bejeck (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15467695#comment-15467695 ] 

Bill Bejeck commented on KAFKA-4131:
------------------------------------

If it's ok, I'll pick this one up

> Multiple Regex KStream-Consumers cause Null pointer exception in addRawRecords in RecordQueue class
> ---------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-4131
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4131
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.1.0
>         Environment: Servers: Confluent Distribution 3.0.0 (i.e. kafka 0.10.0 release)
> Client: Kafka-streams and Kafka-client... commit: 6fb33afff976e467bfa8e0b29eb827
> 70a2a3aaec
>            Reporter: David J. Garcia
>            Assignee: Guozhang Wang
>
> When you start two consumer processes with a regex topic (with 2 or more
> partitions for the matching topics), the second (i.e. nonleader) consumer
> will fail with a null pointer exception.
> Exception in thread "StreamThread-4" java.lang.NullPointerException
>                  at org.apache.kafka.streams.processor.internals.
> RecordQueue.addRawRecords(RecordQueue.java:78)
>                  at org.apache.kafka.streams.processor.internals.
> PartitionGroup.addRawRecords(PartitionGroup.java:117)
>                  at org.apache.kafka.streams.processor.internals.
> StreamTask.addRecords(StreamTask.java:139)
>                  at org.apache.kafka.streams.processor.internals.
> StreamThread.runLoop(StreamThread.java:299)
>                  at org.apache.kafka.streams.processor.internals.
> StreamThread.run(StreamThread.java:208)
> The issue may be in the TopologyBuilder line 832:
> String[] topics = (sourceNodeFactory.pattern != null) ?
> sourceNodeFactory.getTopics(subscriptionUpdates.getUpdates()) :
> sourceNodeFactory.getTopics();
> Because the 2nd consumer joins as a follower, “getUpdates” returns an
> empty collection and the regular expression doesn’t get applied to any
> topics.
> Steps to Reproduce:
> 1.) Create at least two topics with at least 2 partitions each.  And start sending messages to them.
> 2.) Start a single threaded Regex KStream-Consumer (i.e. becomes the leader)
> 3)  Start a new instance of this consumer (i.e. it should receive some of the partitions)
> The second consumer will die with the above exception.



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