Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/791#issuecomment-56334684
@liyezhang556520 Thanks for you comments. 1) yes, the logic is not the same
with the original intention. I have updated my PR to fix this. 2) the origin
logic to calculate `spaceToEnsure` is in consideration of single thread, I have
updated that logic. 3) I didn't drop blocks lazily. `unrollSafely` will call
`DroppingTask#runTask` and wait it done.
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