Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/5403#issuecomment-96269096
Actually I lied - in the codebase we do have some flags we use only for
performance analysis. One is "spark.shuffle.sync" which forces writes to sync
to disk much more aggresively. It has no use to end-users other than for doing
performance analysis of the shuffle. Though it is much more hidden and low
level than this proposal here.
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/storage/BlockManager.scala#L650
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