Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/18711
In the past days we often assume that in standalone mode, if we don't set
the "spark.executor.cores" property, then we should have no more than one
executor per host, but this PR explains a senario that we could still have
multiple executors running on the same host under such condition, I think it
would be helpful for us to understand some corner case behaviors, so yea I
think we should document the behavior somewhere. Also cc @JoshRosen @cloud-fan
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