Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/2108#issuecomment-55016146
@scwf Actually we already try several times before getting a free one. My
interpretation of this is we simply ran out of ports, such that no matter how
many times we retry we can't get a free one. Using a random port for the UI
certainly reduces probability of collision, but yes it is definitely not the
final solution as it simply puts maven tests on par with SBT tests, the latter
of which still fail sometimes but not always.
@JoshRosen #2259 may help for PySpark tests, but `SparkSubmitSuite` and
`DriverSuite` are run before those, so regardless we need to find another way
to reduce the number of ports used.
One solution @JoshRosen and I discussed is to simply not start the SparkUI
during tests (maybe except for the `UISuite`). This alone will surely free up a
significant number of ports we currently occupy.
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