Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/1715#issuecomment-51006757
Well my understanding is that `--class` refers to a class that's in the
primary jar, and this class may refer to other classes in other secondary jars.
I also thought about the config thing too, but that means spark-submit
behavior would be different if you had some hidden configuration somewhere,
which is also not super intuitive in my opinion. Imagine if you intended to
pass `--` to your application, but because you forgot to remove this config
your application behaves differently (but does not fail immediately).
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