Github user zsxwing commented on the pull request:

    https://github.com/apache/spark/pull/9991#issuecomment-160714495
  
    > Sorry, I don't follow. SparkListenerApplicationEnd is posted by 
SparkContext.stop, which is the same place where you're adding the hook to 
clean up the listener. So it should behave exactly the same way, no?
    
    It's a bit different because the location of `postApplicationEnd()` is at 
the beginning of `stop`?
    
    Not related to this issue: I just noticed the location in 
`postApplicationEnd()` may be not in the correct place. There is a race 
condition that after `postApplicationEnd()`, some task/job events will still be 
put into the listener bus. Is it safe to move `postApplicationEnd()` to the 
bottom of `stop`? Then I think it's exactly the same way that adding a hook.


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