Github user sitalkedia commented on the issue:

    https://github.com/apache/spark/pull/16291
  
    Thanks guys for your input. I have made changes to support grouping of 
listeners to preserve the existing synchronization behavior. Currently, the 
`ExecutionAllocationManager`, `HeartbeatReceiver` and `EventLogger` use their 
separate threads.  All User developed `Listerners` use a separate thread and 
all other belong to a default group.  Let me know what you think the approach.
    
    @rxin, @vanzin, @markhamstra , @mridulm .


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