Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2244#issuecomment-54249608
I observed a large performance difference on a microbenchmark that only
called `os.fork()` in Python, plus the script in SPARK-3333 didn't move much
data during the shuffle (since the RDD only contained 3 items total), so I
think it's more likely that the performance difference is due to the
virtualization technique than the disks. Also, the cross-version comparisons
were run on the same `m3` nodes, so they should have both been using the same
disk setup.
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