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https://issues.apache.org/jira/browse/KAFKA-4269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15745818#comment-15745818
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ASF GitHub Bot commented on KAFKA-4269:
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Github user bbejeck closed the pull request at:
https://github.com/apache/kafka/pull/2090
> Multiple KStream instances with at least one Regex source causes NPE when
> using multiple consumers
> --------------------------------------------------------------------------------------------------
>
> Key: KAFKA-4269
> URL: https://issues.apache.org/jira/browse/KAFKA-4269
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.1.0
> Reporter: Bill Bejeck
> Assignee: Bill Bejeck
> Fix For: 0.10.1.1, 0.10.2.0
>
>
> I discovered this issue while doing testing for for KAFKA-4114.
> KAFKA-4131 fixed the issue of a _single_ KStream with a regex source on
> partitioned topics across multiple consumers.
> //KAFKA-4131 fixed this case assuming an "foo*" topics are partitioned
> KStream kstream = builder.source(Pattern.compile("foo.*"));
> KafkaStream stream = new KafkaStreams(builder, props);
> stream.start();
> This is a new issue where there are _multiple_
> KStream instances (and one has a regex source) within a single KafkaStreams
> object. When running the second or "following"
> consumer there are NPE errors generated in the RecordQueue.addRawRecords
> method when attempting to consume records.
> For example:
> KStream kstream = builder.source(Pattern.compile("foo.*"));
> KStream kstream2 = builder.source(.....): //can be regex or named topic
> sources
> KafkaStream stream = new KafkaStreams(builder, props);
> stream.start();
> By adding an additional KStream instance like above (whether Regex or Named
> topic) causes a NPE when run as "follower"
> From my initial debugging I can see the TopicPartition assignments being set
> on the "follower" KafkaStreams instance, but need to track down why and where
> all assignments aren't being set.
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