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https://issues.apache.org/jira/browse/BEAM-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546252#comment-17546252
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Kenneth Knowles commented on BEAM-1591:
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This issue has been migrated to https://github.com/apache/beam/issues/18134
> Implement Combine optimizations for GABW in streaming
> -----------------------------------------------------
>
> Key: BEAM-1591
> URL: https://issues.apache.org/jira/browse/BEAM-1591
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Reporter: Amit Sela
> Priority: P3
>
> This should be straight-forward.
> Introduce {{AccumT}} generics in {{SparkGroupAlsoByWindowViaWindowSet}} and
> call with {{InputT}} for GBK and {{AccumT}} with Combine.
> Pass the proper {{SystemReduceFn}} instead of creating it in
> {{SparkGroupAlsoByWindowViaWindowSet}}.
> For combine, extract the output from the fired accumulated output.
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