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https://issues.apache.org/jira/browse/FLINK-21780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17320234#comment-17320234
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Dawid Wysakowicz commented on FLINK-21780:
------------------------------------------

Hey [~akalashnikov] [~pnowojski] Could this be related to FLINK-21990?

> SourceStreamTaskTest hangs (no output for 900 seconds)
> ------------------------------------------------------
>
>                 Key: FLINK-21780
>                 URL: https://issues.apache.org/jira/browse/FLINK-21780
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Task
>    Affects Versions: 1.12.2
>            Reporter: Guowei Ma
>            Priority: Major
>              Labels: test-stability
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=14600&view=logs&j=f0ac5c25-1168-55a5-07ff-0e88223afed9&t=39a61cac-5c62-532f-d2c1-dea450a66708&l=8725
> {code:java}
> "Legacy Source Thread -  (1/1)" #69 prio=5 os_prio=0 cpu=20194.77ms 
> elapsed=1031.47s tid=0x00007fbb54dbd800 nid=0x6816 sleeping 
> [0x00007fbadd6d5000]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>       at java.lang.Thread.sleep([email protected]/Native Method)
>       at 
> org.apache.flink.streaming.runtime.tasks.SourceStreamTaskTest$WasInterruptedTestingSource.run(SourceStreamTaskTest.java:918)
>       at 
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:110)
>       at 
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:66)
>       at 
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:262)
> {code}



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