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https://issues.apache.org/jira/browse/FLINK-13275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16885891#comment-16885891
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Kostas Kloudas commented on FLINK-13275:
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Yes [~till.rohrmann], this affects only the {{master}} and not the release-1.9.
I also a PR almost ready.
> Race condition in SourceStreamTaskTest.finishingIgnoresExceptions()
> -------------------------------------------------------------------
>
> Key: FLINK-13275
> URL: https://issues.apache.org/jira/browse/FLINK-13275
> Project: Flink
> Issue Type: Bug
> Components: Tests
> Affects Versions: 1.10.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Priority: Critical
> Labels: test-stability
> Fix For: 1.10.0
>
>
> Travis run https://api.travis-ci.org/v3/job/558897776/log.txt with the race
> condition.
> The race condition consists of the following series of steps:
> 1) the {{finishTask}} of the source puts the {{POISON_PILL}} in the
> {{mailbox}}. This will be put as first letter in the queue because we call
> {{sendPriorityLetter()}} in the {{MailboxProcessor}}.
> 2) then in the {{cancel()}} of the source (called by the {{cancelTask()}}
> leads the source out of the run-loop which throws the exception in the test
> source. The latter, calls again {{sendPriorityLetter()}} for the exception,
> which means that this exception letter may override the previously sent
> {{POISON_PILL}} (because it jumps the line),
> 3) if the {{POISON_PILL}} has already been executed, we are good, if not,
> then the test harness sets the exception in the
> {{StreamTaskTestHarness.TaskThread.error}}.
> To fix that, I would suggest to follow a similar strategy for the root
> problem https://issues.apache.org/jira/browse/FLINK-13124 as in release-1.9.
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