Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/333#issuecomment-71722351
We can bind the `unlink`to the `pre-clean` phase, see if that helps.
All in all, if it does not work, it does not work. This is a nice utility,
by no way crucial enough to spent huge amounts of time on it...
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