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https://issues.apache.org/jira/browse/BEAM-935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17132125#comment-17132125
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Beam JIRA Bot commented on BEAM-935:
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This issue is P2 but has been unassigned without any comment for 60 days so it
has been labeled "stale-P2". If this issue is still affecting you, we care!
Please comment and remove the label. Otherwise, in 14 days the issue will be
moved to P3.
Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed
explanation of what these priorities mean.
> Pre-aggregation for group-by-key
> --------------------------------
>
> Key: BEAM-935
> URL: https://issues.apache.org/jira/browse/BEAM-935
> Project: Beam
> Issue Type: Improvement
> Components: runner-apex
> Reporter: Thomas Weise
> Priority: P2
> Labels: stale-P2
>
> Apex runner currently does not perform pre-aggregation of results in GBK.
> Depending on the input data volume the result iterable for a given window can
> grow very large and lead to performance degradation and out of memory errors.
> This can be mitigated by applying the combine function during GBK.
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