Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/4787
I was looking into
[FLINK-6615](https://issues.apache.org/jira/browse/FLINK-6615), and I think
6615 is not a problem due to files may be created concurrently. But I found the
current impl of `deleteDirectory()` to be cumbersome.
The new code also handles concurrent removals well, and I can add back
`cleanDirectory()` though it's not used anywhere yet. I'm happy to keep the
original impl if you prefer it. Which version do you like better?
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