Github user serialx commented on the pull request:
https://github.com/apache/spark/pull/7443#issuecomment-124042965
> I see, but what is the use case in allowing the slave nodes in the
cluster to be able to submit to the master?
It's actually allowing users outside the cluster to be able to submit the
job. Not from the slave.
> No, I don't think so. If the user wishes to use cluster mode s/he can
configure the security groups himself / herself on the EC2 console, but I think
by default we should keep these ports closed to the rest of the world.
If so, what's the purpose of the `--authorized-address` flag? It's quiet
useless flag except for viewing some log files.
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