Github user srowen commented on the pull request:

    https://github.com/apache/spark/pull/4759#issuecomment-76031791
  
    Hm, I was going to say that `createTempDir` will do something more, and 
create a subdirectory. But now looking at the code, isn't the point to create a 
*sub*-directory of the user-supplied directory? It doesn't do that. You know 
this pretty well @vanzin , is that OK? if so, given SPARK-5801, I think we want 
to avoid the extra directory? In which case this change is OK.


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