Github user preaudc commented on the pull request:
https://github.com/apache/spark/pull/2855#issuecomment-62119248
As @ryan-williams pointed out, this is initially only a workaround to
SPARK-3967.
I have still no idea why the move fails (with a {{Permission denied}}) when
the source and target files are not on the same partition (it is no more
atomic, but it should succeed anyway).
I have made this patch because it does not seem necessary to download the
file into another local directory then move it (it may cause a copy instead of
a rename, and does in fact here).
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