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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