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e7c9ca560b
Raft replication doesn't guarantee that all replicas see identical Raft state at all times, it only guarantees the same order of events on all replicas. When comparing raft state with gossip state on a node, first issue a read barrier to ensure the node has the latest raft state. To issue a read barrier it is sufficient to alter a non-existing state: in order to validate the DDL the node needs to sync with the leader and fetch its latest group0 state. Fixes #13518 (flaky topology test). Closes #13756