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https://issues.apache.org/jira/browse/BEAM-9565?focusedWorklogId=407626&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-407626
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ASF GitHub Bot logged work on BEAM-9565:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 22/Mar/20 15:45
            Start Date: 22/Mar/20 15:45
    Worklog Time Spent: 10m 
      Work Description: lukecwik commented on pull request #11190: [BEAM-9565] 
Fix threading issue with WatermarkEstimatorsTest
URL: https://github.com/apache/beam/pull/11190
 
 
   The issue was that the thread was calling an update method that wasn't going 
through the wrapper object which was providing synchronization. Since the 
wrapper objects only support exposing ManualWatermarkEstimator and 
TimestampObservingWatermarkEstimator, there was no way to meaningfully test the 
base one since it doesn't expose any "update" methods.
   
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 407626)
    Remaining Estimate: 0h
            Time Spent: 10m

> WatermarkEstimatorsTest.testThreadSafeWatermarkEstimator is flaky
> -----------------------------------------------------------------
>
>                 Key: BEAM-9565
>                 URL: https://issues.apache.org/jira/browse/BEAM-9565
>             Project: Beam
>          Issue Type: Test
>          Components: sdk-java-core
>            Reporter: Ismaël Mejía
>            Assignee: Luke Cwik
>            Priority: Critical
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Seems like a tiny time difference is producing the flake. This is the log of 
> a run that failed on it 
> [https://builds.apache.org/job/beam_PreCommit_Java_Commit/10470/testReport/junit/org.apache.beam.sdk.fn.splittabledofn/WatermarkEstimatorsTest/testThreadSafeWatermarkEstimator/]
>  
> Can you PTAL [[email protected]]



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