[jira] [Created] (KAFKA-4269) Multiple KStream instances with at least one Regex source causes NPE when using multiple consumers

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

Bill Bejeck created KAFKA-4269:
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             Summary: 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: Guozhang Wang


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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