Github user witgo commented on the pull request:
https://github.com/apache/spark/pull/2056#issuecomment-52870430
I think this the root cause here
[ShuffleBlockManager.scala#L207](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/storage/ShuffleBlockManager.scala#L207).
`removeShuffleBlocks` remove to all the blocks / files related to a particular
shuffle. There should be a lot of IO wait.
In our production cluster, through increase the `spark.akka.askTimeout`
can solve this problem.
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