Github user squito commented on the pull request:
https://github.com/apache/spark/pull/5400#issuecomment-132645948
There was an old thread about how `LargeByteBufferHelperSuite.testMapFiles`
and using random number generator instead of repeating the same bytes over and
over again -- I switched to an XORShiftRandom generator, which makes the test
go from 5s to 11s on my laptop.
The only other remaining issue that I know of is that there is a test that
memory maps a file > 2GB, but there wasn't any consensus on what to do. I'll
gladly introduce test tags separately if that will alleviate concerns.
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