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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