Github user srowen commented on the pull request:

    https://github.com/apache/spark/pull/7598#issuecomment-123861245
  
    I think there are generally no un-resolvable Scala warnings in Spark, and I 
do find it's been necessary several times to go back and squash lots of 
warning-generating code that's been committed. Some Scala warnings in 2.10 are 
errors in 2.11, even. So, yeah I'd prefer to enforce this more strictly too.


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