Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/2470#issuecomment-56292164
It really depends on the number of zero-sized blocks. One thing we can
possibly do is to create a compressed bitmap to track zero sized blocks, as
discussed here:
http://apache-spark-developers-list.1001551.n3.nabble.com/Eliminate-copy-while-sending-data-any-Akka-experts-here-td7127.html#a7146
Maybe we can use the ewah by @lemire
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