Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2746#issuecomment-60799644
One question: is `spark.dynamicAllocation.minExecutors` necessary? Can't
that be set to the initial number of executors requested by the user (i.e.
`spark-submit --num-executors`)? That seems more logical to me, otherwise you
have this weird situation:
* --num-executors = 1
* spark.dynamicAllocation.minExecutors = 10
* spark.dynamicAllocation.maxExecutors = 20
After the dynamic allocation code runs and your app goes back to idle,
you'll end up with 11 (or 10? didn't follow the math closely) executors running.
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