Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/18290
@jiangxb1987 , I think using environment variable to check if there's
number of same-node workers connected id potentially vulnerable, user can
manually start worker one by one without setting this environment variables. So
maybe if workers fail fast due to port collision and print out enough
information, that should be enough to alarm user.
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