Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/18253
  
    The PR description is good for explaining the new behavior, but can you say 
more about the implementation?
    
    IMO, we just need to duplicate the event queue for each important listener 
like event logging listener, and non-important listeners can share one event 
queue like the current behavior. Then each event queue is processed by an 
individual thread.


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