Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/18322
I see, I understand your changes now.
IMO, because user specifically request for 3 cores per executor (as an
example), it is not so good to allocate 1 executor with only 1 core, this may
break user's purpose. Also the original behavior of `Master` is to not allocate
executor with residual resources, we should keep the convention.
Besides, I think it would be better to add some warning logs in
`SparkSubmit` when total cores is not divisible by cores per executor.
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