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

["Guozhang Wang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-4218.
----------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 1.1.0)
                   2.1.0

This has been resolved by https://github.com/apache/kafka/commit/bcc712b45820da74b44209857ebbf7b9d59e0ed7 from [~jeyhunkarimov]


> 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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