Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18211
If I read correctly, you're changing the wire protocol, aren't you?
That's bad. It means a new Spark cannot talk to an old shuffle service. We
can't force people to upgrade the shuffle service just to use a new Spark
version - that's part of the infrastructure and may require downtime of other
services such as YARN.
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