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The image shows three situations: normal operation, failure of master, recovered master.
Normal operation: Users are connected to applications that update Database A and Database B, which are both masters. The masters replicate to each other.
Failure of master: All users now connect to the applications that update Database B. No replication occurs.
Recovered master: Some users reconnect to applications that update Database A. Some applications send updates to Database A and some applications send updates to Database B. The masters replicate to each other.
End of description.