Github user maver1ck commented on the pull request:
https://github.com/apache/spark/pull/4027#issuecomment-167260638
I agree.
In YARN mode we have configuration per node
```
YARN: The --num-executors option to the Spark YARN client controls how many
executors it will allocate on the cluster, while --executor-memory and
--executor-cores control the resources per executor.
```
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