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Posted to issues@beam.apache.org by "David Morávek (Jira)" <ji...@apache.org> on 2020/05/06 09:22:00 UTC

[jira] [Resolved] (BEAM-9888) @RequiresTimeSortedInput might feed data out of order

     [ https://issues.apache.org/jira/browse/BEAM-9888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Morávek resolved BEAM-9888.
---------------------------------
    Resolution: Fixed

> @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 10m
>  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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