Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5722#issuecomment-137254438
Either way I agree with @vanzin that this is not the right fix. I've run
Spark in a fire-walled environment where I had to assign a special port to each
component that would otherwise default at 0. E.g. connection manager at port
9910, block manager at port 9920, executor at port 9930 etc. This is
effectively the same as specifying a port range if we set
`spark.port.maxRetries = 10`.
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