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https://issues.apache.org/jira/browse/KAFKA-8871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-8871.
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    Resolution: Won't Fix

With the new type-safe PAPI (v2) `ValueTransformerWithKey` is going to be 
deprecated, so this ticket does not apply any longer.

> Allow timestamp manipulation in ValueTransformerWithKey
> -------------------------------------------------------
>
>                 Key: KAFKA-8871
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8871
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Levani Kokhreidze
>            Priority: Minor
>              Labels: needs-kip
>
> h3. Motivation
> When using `KStream#transform` in Kafka Streams DSL to manipulate the 
> timestamp, `KStreamImpl#transform` implementation marks *repartitionRequired* 
> as *true,* which isn't necessarily okay when one may just want to manipulate 
> with timestamp without affecting the key. It would be great if DSL user could 
> manipulate the timestamp in `ValueTransformerWithKey`.



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