Github user brkyvz commented on the pull request: https://github.com/apache/spark/pull/9373#issuecomment-152867985 @harishreedharan Here are some benchmark results: For reference, the driver was a r3.2xlarge EC2 instance. ![image](https://cloud.githubusercontent.com/assets/5243515/10871515/54c14846-809e-11e5-91e6-2ac3605d98b7.png) |Num Threads | Rate (ms / file) | Speed-up| |-------------------|--------------------------|-------------------| |50| 5.556101934| 9.004997951| |25| 5.99898194| 8.340196225| |8| 8.692144733| 5.756080699| |4 |14.1162362 |3.544336169| |1 |50.03268653 |1|
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