Github user srowen commented on the pull request:

    https://github.com/apache/spark/pull/6852#issuecomment-112712207
  
    Yes I understand that argument, though have you observed a failure as a 
result?
    There are certainly some memory barriers in between the writes and reads 
without this.
    If you go this route, there are 1000 other places this needs to change in 
Spark. I am not sure it helps to do it piecemeal, and not sure it fixes 
something?


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