Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2866#issuecomment-59990095
I've updated this to use Roaring Bitmap for tracking which blocks are
non-empty. I also changed HighlyCompressedMapStatus to use the average size of
only non-empty blocks; this should provide better estimates for map outputs
that contain a few huge partitions and many empty ones.
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