Github user heary-cao commented on the issue:
https://github.com/apache/spark/pull/20516
@srowen, I think this is a function provided by spark for port use,
One is that the spark user only needs to specify start port and the offset
of ports (spark.port.maxRetries settings), the port binding is automatically
generated by the spark.
two is that when the spark user has must be bind the specified port (set
spark.port.maxRetries = 0). but, Once the specified port has been bound to the
system, then spark will be thrown bind exception.
thanks.
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