Github user tgravescs commented on the issue:
https://github.com/apache/spark/pull/18388
making the external shuffle service incompatible is a huge issue for
deployments. For the yarn side you would have to have the nodemanager run 2
versions (which as far as I know hasn't been tested). Unless we have a very
good reason we shouldn't do it. I think that would be considered api change
and would have to be in major verison (3.x line)
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