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https://issues.apache.org/jira/browse/BEAM-9733?focusedWorklogId=425096&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-425096
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ASF GitHub Bot logged work on BEAM-9733:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Apr/20 15:54
Start Date: 19/Apr/20 15:54
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-616168344
Run Flink Runner Nexmark Tests
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Issue Time Tracking
-------------------
Worklog Id: (was: 425096)
Time Spent: 6h 20m (was: 6h 10m)
> 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: 6h 20m
> 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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