Github user sitalkedia commented on the pull request:

    https://github.com/apache/spark/pull/12096#issuecomment-204176861
  
    @JoshRosen - Thanks a lot for helping out on this. We are trying to port 
some of our large hadoop jobs to Spark and we are seeing these performance 
bottlenecks. We will definitely keep reporting them as we discover more. 
      


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