Github user shivusondur commented on the issue:

    https://github.com/apache/spark/pull/22677
  
    @jiangxb1987 @dongjoon-hyun 
    I have modified accordingly.
    
    Tested locally with existing UT (to make drop the event, locally 
"LISTENER_BUS_EVENT_QUEUE_CAPACITY" is set to 1), using println.
    Tested as in below snap. 
    ![screenshot from 2018-10-15 
14-51-48](https://user-images.githubusercontent.com/7912929/46943354-1967cf80-d08d-11e8-8ffc-4c6d536a077b.png)
    
    
    
    



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