Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7443#issuecomment-122003655
Isn't opening port 6066 to the world a huge security risk since it would
allow arbitrary code execution? It may be safe to open provided that you
configure authentication, but I don't think that we should have an
unauthenticated application submission port open by default in the stock
configuration.
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