Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/266#issuecomment-39646423
Hey @srowen does `FastBufferedOutputStream` offer any performance advantage
over `BufferedOutputStream` that might cause regressions? We use these in a few
places during the shuffle that are fairly performance sensitive (though maybe
since it all ends up going through the OS/page cache the bottleneck isn't in
Spark anyways). Just wondering if you had any knowledge of specific differences.
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