Github user nishkamravi2 commented on the pull request:

    https://github.com/apache/spark/pull/5085#issuecomment-84215052
  
    Hey @pwendell, a constant sub-second increase in execution time during the 
lifetime of an app should be acceptable. We tend to regress significantly more 
than with every Spark version as we pile up more code (we generally try to 
avoid reporting regressions of < 5%). Having to worry about two jar files as 
opposed to one on the other hand seems like a much more fundamental usability 
concern IMO. 


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