Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/16345
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GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/16345
[SPARK-17755][Core]Use workerRef to send RegisterWorkerResponse to avoid
the race condition
## What changes were proposed in this pull request?
The root cause of this issue is that
