Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2866#issuecomment-60307770
Based on a [simple
benchmark](https://gist.github.com/JoshRosen/5031568144f96475ed7b), it looks
like Java BitSet performs slightly better for the types of access patterns that
we use in Spark right now. These access patterns can be changed to be more
efficient, but this is a much more involved change that will need to be part of
a larger refactoring of how we send map output statuses to reducers.
Therefore, I'm going to replace my HashSet with a Java BitMap, wait for
Jenkins, then commit this so we can fix this blocker.
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