Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3571#issuecomment-67984571
@jacek-lewandowski my understanding is that you don't need the master to
know the public key of every executor. The master can either disable cert
validation, or have a CA cert in its trust store that can then be used by an
admin to sign the user's certificate, which the user can then use in his app.
If you do something like that, a default configuration for apps wouldn't
work, because each app can potentially have a different certificate. I can see
this being particularly desirable for long-runnning apps such as Spark
Streaming.
Also, it seems there are legitimate style check failures in your patch -
that's why tests aren't running.
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