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https://issues.apache.org/jira/browse/BEAM-9888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17104430#comment-17104430
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Jan Lukavský commented on BEAM-9888:
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[~ibzib]reiterating on this, as we have a blocker BEAM-9947, which will
probably mean we need to rebuild RC, can we backport this as well?
> @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 40m
> 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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