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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