Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4565#issuecomment-74064507
OK, in any event, this change can't be made. It affects other code using
this method.
I am not sure (?) that this is the intended effect of `addJar`. You can add
new jars; overwriting probably doesn't make the classes unload, yes. That could
be an argument for disallowing overwrite for this use case, but not an argument
for removing the functionality from this method for everyone.
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