Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2944#issuecomment-60857353
I've thought about that, but it looks like we don't actually create
addressable actors on the executors, so there's no path for the driver to send
an RPC to the executor (other than as a reply to a RPC received from an
executor).
I _do_ have an ActorSystem ref, though, so I suppose that I could create a
new actor for this that lives inside of the Executor.
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