Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/2746#issuecomment-60041418
YARN provides (2). After an app makes a request for X executors, YARN
keeps track of them until the app goes away. In fact, the API to YARN isn't "I
want X more executors", but "I want X executors". I.e. a new request
overwrites the old ones (it's a little more convoluted when requests are for
particular locations, but basically the same concept).
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