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https://issues.apache.org/jira/browse/BEAM-576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15938618#comment-15938618
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Thomas Groh commented on BEAM-576:
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Yes. Additionally, if we don't set a GC timer we won't promptly expire a window
that is expired and flush any remaining output.
> ReduceFnRunner should GC based on current WM, not on a fired Timer
> ------------------------------------------------------------------
>
> Key: BEAM-576
> URL: https://issues.apache.org/jira/browse/BEAM-576
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Thomas Groh
> Priority: Minor
>
> ReduceFnRunner currently uses the time of a timer to determine if it is the
> garbage collection timer. Instead, it should examine the time a window is
> expired and the current input watermark to determine if the window should be
> Garbage Collected. It should additionally ignore all timers for windows that
> have already been expired.
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