Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/5657#issuecomment-96455354
If retry, then master will use another port. We can see it from
`Utils.scala`:
>for (offset <- 0 to maxRetries) {
...
((startPort + offset - 1024) % (65536 - 1024)) + 1024
>logWarning(s"Service$serviceString could not bind on port $tryPort. " +
s"Attempting port ${tryPort + 1}.")
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