Github user Ishiihara commented on the pull request:

    https://github.com/apache/spark/pull/2470#issuecomment-56277955
  
    Thanks for the reply. Another questions, In hash shuffle write, the data 
may be screwed for different map output file. For some cases, the reducer may 
try to fetch many files which does not contain its data. What is the overhead 
does this introduces? 


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