Github user GrahamDennis commented on the pull request:

    https://github.com/apache/spark/pull/1890#issuecomment-57956359
  
    @rxin, @ash211 It would be good to have a conversation about whether this 
is the best approach.
    
    My approach is a sort-of brute-force approach of just adding the 
application jar to the classpath, but another approach might be to use an 
isolated classloader for the user application jar that only includes 
org.apache.spark.*.  This would reduce conflicts with transitive dependencies.  
I'm not familiar with this type of classloader magic, so I don't know how 
feasible this would be.


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