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https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989837#comment-15989837
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Jeyhun Karimov commented on KAFKA-4218:
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[~mjsax], thanks for your comments. I absolutely agree on this. I think the 
most relevant issues to group (with this issue) are (as shown in relevant links 
as well) :  KAFKA-4726 and KAFKA-3745 (although there is assignee, I haven't 
seen PR on this issue and it is stale for some time). Do you agree on this or 
are there other relevant issues that should be added to this group?


> 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
>              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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