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https://issues.apache.org/jira/browse/KAFKA-3817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15325216#comment-15325216
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ASF GitHub Bot commented on KAFKA-3817:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1488
> KTableRepartitionMap should handle null inputs
> ----------------------------------------------
>
> Key: KAFKA-3817
> URL: https://issues.apache.org/jira/browse/KAFKA-3817
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0
> Reporter: Jeff Klukas
> Assignee: Guozhang Wang
> Fix For: 0.10.0.1
>
>
> When calling {{KTable.groupBy}} on the result of a KTable-KTable join, NPEs
> are raised:
> {{org.apache.kafka.streams.kstream.internals.KTableRepartitionMap$
> > KTableMapProcessor.process(KTableRepartitionMap.java:88)}}
> The root cause is that the join is expected to emit null values when no match
> is found, but KTableRepartitionMap is not set up to handle this case.
> On the users email list, [~guozhang] described a plan of action:
> I think this is actually a bug in KTableRepartitionMap
> that it actually should expect null grouped keys; this would be a
> straight-forward fix for this operator, but I can make a pass over all the
> repartition operators just to make sure they are all gracefully handling
> null keys.
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