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https://issues.apache.org/jira/browse/BEAM-9307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548357#comment-17548357
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Danny McCormick commented on BEAM-9307:
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This issue has been migrated to https://github.com/apache/beam/issues/19999

> Put windows inside the key to avoid having all values for the same key in 
> memory
> --------------------------------------------------------------------------------
>
>                 Key: BEAM-9307
>                 URL: https://issues.apache.org/jira/browse/BEAM-9307
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-spark
>            Reporter: Etienne Chauchot
>            Priority: P3
>              Labels: stale-assigned, structured-streaming
>
> On both group by key and combinePerKey.
> Like it was done for the current runner.
> See: [https://www.youtube.com/watch?v=ZIFtmx8nBow&t=721s] min 10



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