Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5722#issuecomment-137253831
> More importantly imagine running the web UI on port 80; it doesn't make
sense to march through 81, 82, 83 as those are different well-known ports.
I would argue that Spark should never use any well-known ports (below
1024). I think it's OK for Spark to retry at 1025 and beyond. I thought the
original motivation was for ports that start at 0, where we will pick a random
port within a user-specified range that's smaller than 1024 - 65536. Is that
not the case?
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