[jira] [Updated] (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:all-tabpanel ]

Matthias J. Sax updated KAFKA-4218:
-----------------------------------
    Labels: api needs-kip newbie  (was: api newbie)

> 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
>              Labels: api, needs-kip, newbie
>
> 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.



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