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Posted to jira@kafka.apache.org by "Bill Bejeck (JIRA)" <ji...@apache.org> on 2019/02/22 17:22:00 UTC

[jira] [Assigned] (KAFKA-7492) Explain `null` handling for reduce and aggregate

     [ https://issues.apache.org/jira/browse/KAFKA-7492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bill Bejeck reassigned KAFKA-7492:
----------------------------------

    Assignee: Bill Bejeck

> Explain `null` handling for reduce and aggregate
> ------------------------------------------------
>
>                 Key: KAFKA-7492
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7492
>             Project: Kafka
>          Issue Type: Improvement
>          Components: documentation, streams
>            Reporter: Matthias J. Sax
>            Assignee: Bill Bejeck
>            Priority: Minor
>              Labels: beginner, docs, newbie
>
> We currently don't explain how records with `null` value are handled in reduce and aggregate. In particular, what happens when the users' aggregation/reduce `apply()` implementation returns `null`.
> We should update the JavaDocs accordingly and maybe also update the docs on the web page.
> Cf. https://stackoverflow.com/questions/52692202/what-happens-if-the-aggregator-of-a-kgroupedstream-returns-null



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