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https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746569#comment-16746569
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Matthias J. Sax commented on KAFKA-4218:
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Done. Re-opened a ticket, updated a another ticket, and created two new ones.
Also linked all tickets to each other and updated the KIP page accordingly.
> 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: 1.1.0
>
>
> 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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