Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/81#issuecomment-46240527
I also need to write tight firewall rules around Spark but can't because
Spark works open up random ports and connect to each other on those ports.
I've opened https://issues.apache.org/jira/browse/SPARK-2157 as the larger
issue on behalf of our cloud ops team.
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