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https://issues.apache.org/jira/browse/BEAM-956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546183#comment-17546183
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Kenneth Knowles commented on BEAM-956:
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This issue has been migrated to https://github.com/apache/beam/issues/18069
> Execute ReduceFnRunner Directly in Flink Runner
> -----------------------------------------------
>
> Key: BEAM-956
> URL: https://issues.apache.org/jira/browse/BEAM-956
> Project: Beam
> Issue Type: Improvement
> Components: runner-flink
> Reporter: Aljoscha Krettek
> Priority: P3
>
> Right now, a {{ReduceFnRunner}} is executed via
> {{GroupAlsoByWindowViaWindowSetDoFn}} which in turn is executed via a
> {{DoFnRunner}}. We should change that to get rid of the dependence on
> {{GroupAlsoByWindowViaWindowSetDoFn}} which is an {{OldDoFn}} and also to get
> rid of some unneeded layering.
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