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https://issues.apache.org/jira/browse/BEAM-12040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416259#comment-17416259
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Beam JIRA Bot commented on BEAM-12040:
--------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> WriteFiles withRunnerDeterminedSharding for unbounded data doesn't work with
> merging windows
> --------------------------------------------------------------------------------------------
>
> Key: BEAM-12040
> URL: https://issues.apache.org/jira/browse/BEAM-12040
> Project: Beam
> Issue Type: Improvement
> Components: io-java-files
> Reporter: Siyuan Chen
> Priority: P3
> Time Spent: 5h 50m
> Remaining Estimate: 0h
>
> Currently the implementation of `withRunnerDeterminedShardingUnbounded` uses
> a stateful DoFn to achieve the grouping and batching of the input elements,
> which doesn't support session windows. One possible way is to add another GBK
> prior to the stateful DoFn to first get session windows merged and reify the
> window before invoking the sateful DoFn.
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