Github user shijinkui commented on the issue:
https://github.com/apache/flink/pull/2876
> The test should be changed to use more specific folder names including a
random component. If the directory we are trying to create already exists we
should not delete everything there (since we can't guarantee that we created
those files), but instead try a different directory.
@zentol That's file. Also delete the tmp dir when exist.
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