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https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16737524#comment-16737524
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Matthias J. Sax commented on KAFKA-4218:
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I guess fixed version 2.1 is not correct. the KIP is partially implemented in
1.1 via this ticket but no progress since then. Thus, for this ticket 1.1
should be the correct version, but we need further JIRAs to track the open
parts of the KIP? Thoughts?
> Enable access to key in ValueTransformer
> ----------------------------------------
>
> Key: KAFKA-4218
> URL: https://issues.apache.org/jira/browse/KAFKA-4218
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.0.1
> Reporter: Elias Levy
> Assignee: Jeyhun Karimov
> Priority: Major
> Labels: api, kip
> Fix For: 2.1.0
>
>
> While transforming values via {{KStream.transformValues}} and
> {{ValueTransformer}}, the key associated with the value may be needed, even
> if it is not changed. For instance, it may be used to access stores.
> As of now, the key is not available within these methods and interfaces,
> leading to the use of {{KStream.transform}} and {{Transformer}}, and the
> unnecessary creation of new {{KeyValue}} objects.
> KIP-149:
> https://cwiki.apache.org/confluence/display/KAFKA/KIP-149%3A+Enabling+key+access+in+ValueTransformer%2C+ValueMapper%2C+and+ValueJoiner
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