Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/1107#issuecomment-50954618
Looking at netstat more closely, we realized that there is still a port
that's not configurable: the port that the driver connects to the executor on
with Akka. The worker connects to its executor on this port as well, but
because that's a local connection it's not as important from the firewall
perspective. Looking at the master branch now, it also looks like the
driverPropsFetcher right before needs a configurable port as well.
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/executor/CoarseGrainedExecutorBackend.scala#L129
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