Github user KaiXinXiaoLei commented on the pull request:
https://github.com/apache/spark/pull/8668#issuecomment-142201407
@vanzin Yes, ```addExecutors``` will often send message to AM, but the
total number of executors in ```spark-dynamic-executor-allocation``` will be
the same with AM. I think, the total number of executors is get in
```spark-dynamic-executor-allocation```, and send this value to AM, instead of
calculated in ```CoarseGrainedSchedulerBackend```.
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