Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/20706
Ok, I'm going to revert the `createDirectory` changes because the
`Files.createTempDirectory` api forces permissions to `700`, and secure YARN
requires that the block manager directories respect the umask set for the
container or things break. I could fix that in `DiskBlockManager` but reverting
sounds safer.
I'll keep the test changes since they're correct and fix a potential issue
with garbage being left around the working dir.
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