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https://issues.apache.org/jira/browse/KAFKA-7634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16689061#comment-16689061
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Guozhang Wang commented on KAFKA-7634:
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Hi [~efeller] could you try to upgrade to newer version of Kafka? I'd suggest 
you do that and see if the issue still exist.

And you can also use the {{TopologyTestDriver}} under streams:test-utils in the 
new versions to write unit test easily: you do not need to start up a broker 
etc as the test driver will mimic the whole behavior, details here: 

https://kafka.apache.org/documentation/streams/developer-guide/testing.html 

If the issue can be reproduced with the unit test using the test driver under 
the latest version, could you share the test code with me so that I can look 
further into this.

> Punctuate not being called with merge() and/or outerJoin()
> ----------------------------------------------------------
>
>                 Key: KAFKA-7634
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7634
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.11.0.3
>            Reporter: Eugen Feller
>            Priority: Major
>
> Hi all,
> I am using the Processor API and having trouble to get Kafka streams 
> v0.11.0.3 call the punctuate() function after a merge() and/or outerJoin(). 
> Specifically, I am having a topology where I am doing flatMapValues() -> 
> merge() and/or outerJoin -> transform(). If I dont call merge() and/or 
> outerJoin() before transform(), punctuate is being called as expected.
> Thank you very much in advance for your help.



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