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https://issues.apache.org/jira/browse/BEAM-9733?focusedWorklogId=425113&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-425113
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ASF GitHub Bot logged work on BEAM-9733:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 19/Apr/20 18:31
            Start Date: 19/Apr/20 18:31
    Worklog Time Spent: 10m 
      Work Description: mxm commented on issue #11362: [BEAM-9733] Always let 
ImpulseSourceFunction emit a final watermark
URL: https://github.com/apache/beam/pull/11362#issuecomment-616202575
 
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 425113)
    Time Spent: 6.5h  (was: 6h 20m)

> ImpulseSourceFunction does not emit a final watermark
> -----------------------------------------------------
>
>                 Key: BEAM-9733
>                 URL: https://issues.apache.org/jira/browse/BEAM-9733
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Maximilian Michels
>            Assignee: Maximilian Michels
>            Priority: Critical
>             Fix For: 2.21.0
>
>          Time Spent: 6.5h
>  Remaining Estimate: 0h
>
> The Flink Runner's {{ImpulseSourceFunction}} does not emit a final watermark, 
> unless {{--shutdownSourcesOnFinalWatermark}} flag has been specified (the 
> flag is used in tests to shutdown the pipeline after reading all data). Most 
> pipelines will be long-running and thus do not specify the flag. 
> Not sending out the final watermark causes GroupByKey to hold back the data 
> of event time windows until the pipeline is shut down (the final watermark is 
> always emitted on pipeline shutdown which is why using the above flag works).



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