Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/2840#issuecomment-60469995
Alright, as of the latest changes, the interface of requesting executors is
that we specify the number of total executors this application demands rather
than an incremental number. This guarantees that we do not over-allocate
executors due to some race condition (more detail in the code comments). This
should go in before #2746.
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