"Old and new nodes will advertise different schema version because
of different format of schema tables. This will result in attempts
to sync the schema by each of the node.
Currently this will result in scary error messages in logs about
sync failing due to not being able to find schema of given version.
It's benign, but may scare users. It the future incompatibilities
could result in more subtle errors. Better to inhibit it completely."
* 'tgrabiec/fix-schema-pull-errors-during-upgrade' of github.com:cloudius-systems/seastar-dev:
migration_manager: Give empty response to schema pulls from incompatible nodes
migration_manager: Don't pull schema from incompatible nodes
service: Advertise schema tables format version through gossip
(cherry picked from commit 91221e020b)
d475a44b01