re the only database environments
            where replicated databases may be modified. Replication client
            environments are read-only as long as they are clients. Replication
            client environments may be upgraded to be replication master
            environments in the case that the current master fails or there is
            no master present. If master leases are in use, this method cannot
            be used to appoint a master, and should only be used to configure a
            