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https://issues.apache.org/jira/browse/BEAM-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545945#comment-17545945
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Danny McCormick commented on BEAM-311:
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This isn't actually real, but this issue has been migrated to
https://github.com/apache/beam/issues/17856
> Add 'garbage collection' hold when receive late element
> -------------------------------------------------------
>
> Key: BEAM-311
> URL: https://issues.apache.org/jira/browse/BEAM-311
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Mark Shields
> Priority: P3
>
> We currently add a 'garbage collection' hold in WatermarkHold (invoked via
> ReduceFnRunner) if the closing behavior is FIRE_ALWAYS. This means an element
> which has come in too late for a data holds and an end-of-window hold may end
> up setting no hold at all. As a result, the eventual pane containing that
> element may end up dropped as being too late.
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