Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/15009
  
    > Did you have ideas on this?
    
    Nothing fully baked. The closest I got was to have a special interface that 
apps could implement where a `SparkConf` would be passed as an argument, 
instead of having just a random `main(String[])` method as the entry point. 
Then `SparkSubmit` could avoid the system properties route if that interface is 
detected.
    
    Then e.g. YARN's `Client.scala` could implement it, and you could safely 
submit multiple yarn-cluster mode apps from the same JVM.
    
    Anything else I thought of was pretty hacky and a didn't end up giving much 
extra thought.


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