Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/7872#issuecomment-127676478
  
    You have a whole lot of style violations in your code. I'd recommend 
starting off at:
    https://cwiki.apache.org/confluence/display/SPARK/Spark+Code+Style+Guide
    
    You don't need to duplicate the code in `CommandBuilderUtils`. You can add 
a `private[spark]` Scala class that exposes it, similar to this:
    
https://github.com/apache/spark/blob/3c0156899dc1ec1f7dfe6d7c8af47fa6dc7d00bf/core/src/main/scala/org/apache/spark/launcher/WorkerCommandBuilder.scala
    
    Also, there's a lot of changes here. The original attempt at fixing this 
only touched the escaping function, can you explain why do you need to touch 
anything else? I don't have YARN running on Windows so I can't really test any 
of this.


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