Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2739#issuecomment-60182463
There's still sensitive data that may go in control messages; e.g., IIRC
broadcasts go through akka, and those may include things like Hadoop job
configuration and delegation tokens. Anyway, I know there are more channels
that might need securing, but it's ok to treat those separately. Having a
common SSL configuration infrastructure is a good first start.
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