Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/18711
AFAIK when `spark.executor.cores` is not set, we would keep assigning free
cores to the executor until `app.coresLeft` is zero or there is no more free
cores left. So I'm not convinced the comment should be updated. Please correct
me if I'm wrong, thanks!
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