Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4770#issuecomment-76045346
There is also a second thing that is broken by this patch:
`YARN_LOCAL_DIRS` can actually be multiple directories, as the name implies.
The BlockManager uses that to distribute shuffle files across multiple disks,
to speed things up. After this change, everything will end up on the same disk.
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