Github user ksakellis commented on the pull request:
https://github.com/apache/spark/pull/4051#issuecomment-70297739
I'd prefer we don't introduce yet another config option for dynamic
scaling. How much delay are we really introducing here? The number of running
executors will get to maxExecutors (if there are more pending tasks) within one
yarn call. Is the single yarn call really that slow?
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