Github user liancheng commented on the pull request:

    https://github.com/apache/spark/pull/1715#issuecomment-51017797
  
    @pwendell As for the difference between application jars (or secondary 
jars) and primary jar, what is important is the way `SparkSubmit` handles them: 
primary jar is ensured to be the first jar in the CLASSPATH, so that the main 
class specified by `--class` will never be shadowed by some class of the same 
name in some secondary jar. So removing primary resource from the user 
interface (command line options) means:
    
    1. Users must add the primary resource (either jar file or Python file) in 
front of all other jars/python files
    2. Internally, the first jar or first python file should be considered as 
primary
    
    IMHO, these requirements are too implicit...


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