Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/1165#issuecomment-50219496
@mateiz There were a couple of correctness issues with the previous code
that my latest commits have fixed (see commit message for more detail). After
fixing these I have traced through each step by hand myself and verified that
the behavior is as expected and wrote new tests to confirm this. If you have
time, I would encourage you (and others) to step through the code as well
(especially in `unrollSafely` and `ensureFreeSpace`) to make sure the amount
we're requesting / ensuring free space for make sense to you.
Let me know if you find anything. Otherwise this is ready from my side.
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