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https://issues.apache.org/jira/browse/BEAM-935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Beam JIRA Bot updated BEAM-935:
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Labels: stale-P2 (was: )
> 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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