Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/7443#issuecomment-124155683
The purpose of the `--authorized-address` it to restrict the list of
addresses that can see the WebUI or logs with the default being any IP address.
Also can you show a screenshot or a pointer in the code where 4040 is
opened on the slave ? @andrewor14 Do you know anything about this ?
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