Was able to resolve this myself while encountering more and more familiar problems. These are the important take-aways: update the rest of CDH to same version as CM (6.3.1), enable ipv6 for all hosts, prepare the nodes using the CM, restart CDSW Probably forgot a couple of steps here, but these are the ones I remember. At least, the goal of resolving the issue without a rollback was achieved.
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