Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1124#issuecomment-46530520
@mengxr this actually hung up while running tests:
```
[info] MapOutputTrackerSuite:
[info] - compressSize
[info] - decompressSize
[info] - master start and stop
[info] - master register shuffle and fetch
[info] - master register and unregister shuffle
[info] - master register shuffle and unregister map output and fetch
[info] - remote fetch
[info] - remote fetch below akka frame size
```
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