Now that I see this here, I wonder if maybe it just makes sense to note this in the configuration doc below rater than here. It's really only relevant to people mucking with this configuration... which will be a tiny subset of users. Then above maybe we could just change:

"is expected to exist as a local file on each worker node" --> "is expected to exists as a local file wherever jars are loaded (e.g. on workers)." Or something like this, because currently that statement is not correct.