Github user dragos commented on the pull request:
https://github.com/apache/spark/pull/10993#issuecomment-179843161
@Astralidea it will deploy more than one executor on the same slave if
there are enough resources and `spark.cores.max` wasn't reached yet. It's just
that it will first spawn executors on each eligible slave in the current set of
offers, and continue iterating until one of the stop conditions is hit (not
enough resources or the `spark.cores.max` limit).
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