Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/15981
> Since it sends the key over the wire, I think it's better to throw an
exception if securityManager.isSaslEncryptionEnabled() is false.
We don't do that now, and there's a whole lot of things that need to
configured correctly for things to be really secure (like HDFS and YARN
encryption). It would also make unit tests slightly more complicated (or at
least their set up). I think it's fine to just have a warning here.
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