Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/7243#issuecomment-119364467
> Hmm, I think I will punt on fixing the client and defend against NPE's
with null checks
The thing is, if you use the endpoint route, the same code would work for
both client and cluster. You don't need to special case anything. You'd just
send a message to the driver saying "removeExecutor" and the driver would
handle it, regardless of where it is. No plumbing of the "backend" variable
anywhere.
Your current code is explicitly coupled to cluster mode and cannot, ever,
work in client mode. So fixing this for client mode would mean reverting your
changes. So why not do the final change right now?
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