[jira] [Assigned] (KAFKA-13024) Kafka Streams is dropping messages with null key during repartition

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-13024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax reassigned KAFKA-13024:
---------------------------------------

    Assignee:     (was: Alex Sorokoumov)

> Kafka Streams is dropping messages with null key during repartition
> -------------------------------------------------------------------
>
>                 Key: KAFKA-13024
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13024
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 2.8.0, 2.7.1
>            Reporter: Damien Gasparina
>            Priority: Major
>
> {{KStream.repartition}} is silently filtering messages with null keys. A single topology like {{.stream().repartition().to()}} would filter all messages with null key.
> The cause: we are adding a filter before the source & sink nodes ([https://github.com/apache/kafka/blob/2.8/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamImpl.java#L1060-L1064]). It looks like we are doing that because this method is also used for building KTable.
> Null key messages are valid for a KStream, it looks like a regression, the previous {{.through()}} was not filtering null key messages.



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