In a non-tx cache, when the topology id is incremented, owners (both primary and backup) receiving a write command with a lower topology id throw an OutdatedTopologyException so that the originator retries the command on the new owners.

But the originator needs to retry the command only if the owners of the key changed in any way. During a join or a leave, most of the keys should not change owners, so throwing an OutdatedTopologyException is not necessary most of the time.