Github user xuanyuanking commented on the issue:

    https://github.com/apache/spark/pull/18760
  
    The hold mode is still valid, I resolved the conflict and add the logic 
into `AsyncEventQueue`, it can confirm by the test case added in this 
[patch](https://github.com/apache/spark/pull/18760/files#diff-6ddec7f06d0cf5392943ecdb80fcea24R515).
    `Now LiveListenerBus have multiple queue`
    Yep, glad to see SPARK-18838 finally merged and it may resolve the event 
drop problem. But as you say, `it's very unlikely` but may be a hold mode is 
more safety? 



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