Github user jerryshao commented on the issue:
    I think the current fix is a feasible and simple solution for the scenarios 
mentioned above. As far as I understand from the comments above, ideally this 
problem should not be happened, but in a real cluster especially driver is 
stuck by GC or others, this will be happened easily and delay the task 
scheduling, to the extreme going into deadlock situation. 
    My only concern is that will this fix bring in some edge cases due to the 
complexity of this part (though I cannot imagine it currently). Since now idle 
executors will stay in the `executorsPendingToRemove` queue indefinitely.

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