Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5722#issuecomment-137266772
> Ok, I can somewhat see that argument, although I don't see why someone
would require that Spark's UI bind to a specific port. If they're building some
application on top of Spark that has its own UI, I'd understand, but then
they'd have their own code to decide to which port that UI would bind.
Ah I see, I think the use case is if a third party app wants to always
point to the SparkUI at 4040 and would rather fail the driver early if it can't
bind to that port.
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