[jira] [Created] (FLINK-13275) Race condition in SourceStreamTaskTest.finishingIgnoresExceptions()

["Kostas Kloudas (JIRA)" <ji...@apache.org>]

Kostas Kloudas created FLINK-13275:
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             Summary: Race condition in SourceStreamTaskTest.finishingIgnoresExceptions()
                 Key: FLINK-13275
                 URL: https://issues.apache.org/jira/browse/FLINK-13275
             Project: Flink
          Issue Type: Improvement
          Components: Tests
    Affects Versions: 1.10.0
            Reporter: Kostas Kloudas
            Assignee: Kostas Kloudas


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 the same strategy for the root problem https://issues.apache.org/jira/browse/FLINK-13124 as in release-1.9.



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