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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2670) Unstable CombineTaskTest
Date Wed, 16 Sep 2015 13:04:45 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14768901#comment-14768901
] 

Stephan Ewen commented on FLINK-2670:
-------------------------------------

I cannot see any issue with this test. It looks absolutely valid. There is also no deadlock,
the code is in the test's clean-up phase.

There is a concurrent modification during concurrent shutdown/cancel of the job, but that
is perfectly valid and tolerated and handled correctly.

I cannot see why this should take longer than 5 minutes (when the test runs for less than
one second). Two cases could happen:

1.  The code gets stuck in the native method that fills in the stack trace. Whyever would
it do that, I do not know.

2.  It is just a coincidence that the code is there (in cleanup) after 5 minutes and the code
simply took forever to execute the test. I find this highly unlikely, as the test has no busy
loops, it emits slowly some data (no tight loop, sleeps for a msec regularly) and cancels
after 500 msecs.

No idea what to do with this test, it looks almost like a quirk in Travis/Linux/JVM...

> Unstable CombineTaskTest
> ------------------------
>
>                 Key: FLINK-2670
>                 URL: https://issues.apache.org/jira/browse/FLINK-2670
>             Project: Flink
>          Issue Type: Bug
>          Components: Tests
>            Reporter: Matthias J. Sax
>            Assignee: Stephan Ewen
>            Priority: Critical
>              Labels: test-stability
>
> Fails with
> {noformat}
> ==============================================================================
> Maven produced no output for 300 seconds.
> ==============================================================================
> {noformat}
> https://travis-ci.org/apache/flink/jobs/80344487



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