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https://issues.apache.org/jira/browse/KAFKA-16585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17839910#comment-17839910
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Matthias J. Sax commented on KAFKA-16585:
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Well, the use-case make sense, but the question is, how can the runtime ensure
that the key is not changed? The idea of `FixedKeyProcessor` is to ensure that
the key is not changed, but when we allow to set a key, you could set anything
and the runtime cannot ensure that the key is "correct". It would be up the
user-code to do the right thing... what it unclear from your use-case
description is, why can't you use a regular `Processor`?
> No way to forward message from punctuation method in the FixedKeyProcessor
> --------------------------------------------------------------------------
>
> Key: KAFKA-16585
> URL: https://issues.apache.org/jira/browse/KAFKA-16585
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.6.2
> Reporter: Stanislav Spiridonov
> Priority: Major
>
> The FixedKeyProcessorContext can forward only FixedKeyRecord. This class
> doesn't have a public constructor and can be created based on existing
> records. But such record usually is absent in the punctuation method.
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