When I try to SET CLUSTER SETTING to 21.1, an error message says “ERROR: n2 required, but unavailable” (n2 is reference to a node, but n2 doesn’t exist, because I can see it as decommissioned 2 years ago).
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Try decomissioning n2 again. The node's state is currently indeterminate (pre 21.1 versions didn’t know about this “final” decommissioned state). Decomissioning the node once more from a new binary node will let you mark it as decommissioned for good, and let the upgrade proceed. This unclear error message will get fixed when this issue closes.
Michael Butler CRDB
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