Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/16780
Thanks a lot for looking into this~ @zsxwing
You are right. My understanding about this is incorrect.
`CoarseGrainedSchedulerBackend: DriverEndpoint` is a `ThreadSafeRpcEndpoint`,
thus concurrent message processing is disabled.
I'll close this PR.
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