Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/3314#issuecomment-75154828
Not necessarily (set them directly). We have a use case where certain
hosts are restricted to use a subset of ports for communication purposes. On
yarn you might end up with multiple executors on a single host but they can't
share a port so having a range that they automatically find a free one on is
best.
I was actually wanting to implement this as its needed for some of our
customers.
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