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https://issues.apache.org/jira/browse/KAFKA-4619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang updated KAFKA-4619:
---------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
Issue resolved by pull request 2346
[https://github.com/apache/kafka/pull/2346]
> Dissallow to output records with unknown keys in TransformValues
> ----------------------------------------------------------------
>
> Key: KAFKA-4619
> URL: https://issues.apache.org/jira/browse/KAFKA-4619
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.1.0, 0.10.0.0, 0.10.0.1, 0.10.1.1
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Fix For: 0.10.2.0
>
>
> {{KStream#transformValues}} allows the user to return a new value in
> {{punctuate}} and it also allows the user to return any new key value pair
> using {{ProcesserContext#forward}}. For {{punctuate}} the key gets set to
> {{null}} under the hood and for {{forward}} the user can put any new key they
> want. However, Kafka Streams assumes that using {{transformValue}} does not
> change the key -- thus, this assumption might not hold right now resulting
> potentially incorrectly partitioned data.
> Thus, it should not be possible to return any data in {{punctuate}} and
> {{forward}} and we should raise an exception.
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