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https://issues.apache.org/jira/browse/FLINK-37986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17985819#comment-17985819
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Aleksandr Iushmanov commented on FLINK-37986:
---------------------------------------------

It looks like similar problems have been discovered before, but these tickets 
are marked as resolved now.

For example this one:
https://issues.apache.org/jira/browse/FLINK-33641?jql=text%20~%20%22DirectoryNotEmptyException%22

> CoordinatedSourceRescaleITCase.testDownscaling: JUnit5 fails to delete a 
> directory on AZP
> -----------------------------------------------------------------------------------------
>
>                 Key: FLINK-37986
>                 URL: https://issues.apache.org/jira/browse/FLINK-37986
>             Project: Flink
>          Issue Type: Bug
>          Components: Tests
>    Affects Versions: 2.1.0, 2.0.1, 2.1
>            Reporter: Aleksandr Iushmanov
>            Priority: Major
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=68463&view=logs&j=2e8cb2f7-b2d3-5c62-9c05-cd756d33a819&t=49d3c873-4717-5e09-1f8c-9da6a2a97847&l=11254
> ``` 
> Jun 23 18:25:02 Caused by: java.io.IOException: Failed to delete temp 
> directory /tmp/junit-5328027809801367087. The following paths could not be 
> deleted (see suppressed exceptions for details): <root>
> Jun 23 18:25:02       at 
> java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
> Jun 23 18:25:02       at 
> java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:395)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.Sink$ChainedReference.end(Sink.java:258)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.Sink$ChainedReference.end(Sink.java:258)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:510)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> Jun 23 18:25:02       at 
> java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
> Jun 23 18:25:02       ... 5 more
> Jun 23 18:25:02       Suppressed: java.nio.file.DirectoryNotEmptyException: 
> /tmp/junit-5328027809801367087
> Jun 23 18:25:02               at 
> java.base/sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:246)
> Jun 23 18:25:02               at 
> java.base/sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:105)
> Jun 23 18:25:02               at 
> java.base/java.nio.file.Files.delete(Files.java:1152)
> Jun 23 18:25:02               at 
> java.base/java.nio.file.Files.walkFileTree(Files.java:2828)
> Jun 23 18:25:02               at 
> java.base/java.nio.file.Files.walkFileTree(Files.java:2882)
> Jun 23 18:25:02               ... 16 more
> ``` 



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