[jira] [Commented] (KAFKA-4218) Enable access to key in ValueTransformer

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

    [ https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16634781#comment-16634781 ] 

Matthias J. Sax commented on KAFKA-4218:
----------------------------------------

[~lindong] There was no progress on KIP-149 for 2.1 release.

> 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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