Github user skonto commented on the pull request:
https://github.com/apache/spark/pull/11157#issuecomment-218273216
What i was trying to say is that even separate tasks with their own
namespaces and having isolated port numbers need to honour what it is offered
to them and not pick random ports. But i dont know how this is going to be
implemented in 0.29. For example if Task1 needs a random port can just pick it
but if specific port ranges are offered due to restrictions on a slave then
those should be used to choose a random port within them.
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