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https://issues.apache.org/jira/browse/FLINK-5817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869687#comment-15869687
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Stephan Ewen commented on FLINK-5817:
-------------------------------------

I would encourage you to use the JUnit tool to create random temporary folders:

{code}
@Rule
public final TemporaryFolder tmp = new TemporaryFolder();
{code}

Have a look at the {{org.apache.flink.util.FileUtilsTest}} for an example.

> Fix test concurrent execution failure by test dir conflicts.
> ------------------------------------------------------------
>
>                 Key: FLINK-5817
>                 URL: https://issues.apache.org/jira/browse/FLINK-5817
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Wenlong Lyu
>            Assignee: Wenlong Lyu
>
> Currently when different users build flink on the same machine, failure may 
> happen because some test utilities create test file using the fixed name, 
> which will cause file access failing when different user processing the same 
> file at the same time.
> We have found errors from AbstractTestBase, IOManagerTest, FileCacheTest.



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