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Having tablet metadata with more than 1 pending replica will prevent this metadata from being (re)loaded due to sanity check on load. This patch fails the operation which tries to save the wrong metadata with a similar sanity check. For that, changes submitted to raft are validated, and if it's topology_change that affects system.tablets, the new "replicas" and "new_replicas" values are checked similarly to how they will be on (re)load. fixes #20043 (cherry picked from commitf09fe4f351) (cherry picked from commite5bf376cbc) (cherry picked from commit1863ccd900) Refs #21020 Closes scylladb/scylladb#21112 * github.com:scylladb/scylladb: tablets: Validate system.tablets update group0_client: Introduce change validation group0_client: Add shared_token_metadata dependency replica/tablets: Add to_tablet_metadata_(row_)?key helpers replica/tablets: extract tablet_replica_set_from_cell()