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https://issues.apache.org/jira/browse/BEAM-12040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549324#comment-17549324
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Danny McCormick commented on BEAM-12040:
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This issue has been migrated to https://github.com/apache/beam/issues/20928
> 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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