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https://issues.apache.org/jira/browse/BEAM-9888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17100613#comment-17100613
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David Morávek commented on BEAM-9888:
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[~ibzib] this was broken in all prior releases (feature was introduced in
2.20). I've changed the target to 2.22.0.
> @RequiresTimeSortedInput might feed data out of order
> -----------------------------------------------------
>
> Key: BEAM-9888
> URL: https://issues.apache.org/jira/browse/BEAM-9888
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Affects Versions: 2.20.0, 2.21.0
> Reporter: Jan Lukavský
> Assignee: Jan Lukavský
> Priority: Major
> Fix For: 2.22.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> StatefulDoFnRunner drops late data based on output watermark, but output
> watermark might not advance fast enough to discard data that should have been
> dropped. We have to either:
> a) drop data based on input watermark, or
> b) drop data based on timestamp of last emitted element
> I'm a little in favor of b), because it can drop less data.
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