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https://issues.apache.org/jira/browse/KAFKA-12213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17268911#comment-17268911
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Matthias J. Sax commented on KAFKA-12213:
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I am also happy to break into smaller junks... whatever we think works best or
whatever [~MonCalamari] is interested in to work on.
> Kafka Streams aggregation Initializer to accept record key
> ----------------------------------------------------------
>
> Key: KAFKA-12213
> URL: https://issues.apache.org/jira/browse/KAFKA-12213
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Piotr Fras
> Assignee: Piotr Fras
> Priority: Minor
> Labels: needs-kip
>
> Sometimes Kafka record key contains useful information for creating a zero
> object in aggregation Initializer. This feature is to add kafka record key to
> Initializer.
> There were two approaches I considered to implement this feature, one
> respecting backwards compatibility for internal and external APIs and the
> other one which is not. I chose the latter one as it was more strait-forward.
> We may want to validate this approach tho.
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