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https://issues.apache.org/jira/browse/BEAM-7574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16865442#comment-16865442
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Jan Lukavský commented on BEAM-7574:
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Discussion on mailing list:
https://lists.apache.org/thread.html/0e7902dd2be9da3f481b36d068a9d0089bba65d2417d624356680e9c@%3Cdev.beam.apache.org%3E
> Spark runner: Combine.perKey performance issues
> -----------------------------------------------
>
> Key: BEAM-7574
> URL: https://issues.apache.org/jira/browse/BEAM-7574
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Affects Versions: 2.13.0
> Reporter: Jan Lukavský
> Assignee: Jan Lukavský
> Priority: Major
>
> Combine.perKey on current implementation uses technique of creating an
> accumulator for each input key and then merge all these accumulators
> together. Optimize this by:
> * changing accumulator from Iterable to Map, and using addInput as much as
> possible
> * try to move the window explode to pre-shuffle (add window label to key for
> non-merging windows), measure the impact, and if the impact is substantial,
> implement that for at leasit window functions assigning to single (global)
> window or single window per element (tumbling windows)
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