Github user viirya commented on the issue:
https://github.com/apache/spark/pull/15541
One concern I have is the cluster of machines with different codes. It is
possibly if you construct your cluster with solution like ec2 and buy different
kinds of nodes. In this case, the balance assigner would first consume machines
with higher cores, and packed assigner would consume machines with less codes.
I don't know if this is an issue to most of you. Even it is, this might not be
able to solve in this change and we can consider this later.
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