Github user jacek-lewandowski commented on the pull request:
https://github.com/apache/spark/pull/2739#issuecomment-60177158
@vanzin This PR doesn't secure data transfers anyway, because Spark uses
raw communication to exchange the real data. This is intended to secure mainly
control messages, JARS, application settings, like command line arguments and
Spark configuration, because they may include passwords to access third party
data sources from executors.
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