Github user heary-cao commented on the issue:
https://github.com/apache/spark/pull/20516
@jiangxb1987 thank you for review it.
First, the source of` 100 `in the revised` (expectedPort + 100)` must be
after the setting of the spark.testing,
Second, to add some boundary tests, such as port 65535 and Utils.userPort
self circulation to generating port when base port is 65535.
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