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https://issues.apache.org/jira/browse/BEAM-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15998557#comment-15998557
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Davor Bonaci commented on BEAM-1582:
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+1 -- this makes total sense to me.
> ResumeFromCheckpointStreamingTest flakes with what appears as a second firing.
> ------------------------------------------------------------------------------
>
> Key: BEAM-1582
> URL: https://issues.apache.org/jira/browse/BEAM-1582
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Amit Sela
> Priority: Minor
> Labels: flake
>
> See:
> https://builds.apache.org/view/Beam/job/beam_PostCommit_Java_MavenInstall/org.apache.beam$beam-runners-spark/2788/testReport/junit/org.apache.beam.runners.spark.translation.streaming/ResumeFromCheckpointStreamingTest/testWithResume/
> After some digging in it appears that a second firing occurs (though only one
> is expected) but it doesn't come from a stale state (state is empty before it
> fires).
> Might be a retry happening for some reason, which is OK in terms of
> fault-tolerance guarantees (at-least-once), but not so much in terms of flaky
> tests.
> I'm looking into this hoping to fix this ASAP.
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