Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/2030#issuecomment-52664672
@JoshRosen Thanks for testing -- The perf results are a bit surprising
(especially that master branch became faster since the earlier one). I also
realized we do 3 RPCs, as after fetching the block we report back to the
master. We could see if this reporting can be made asynchronous in the future
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