Master and slaver model: When a node is working as master server, the other is working as slaver server for backup.
主从模式：当一台服务器作为主服务器运行某个应用时，另一台服务器就是备份机。
Master and slaver model: When a node is working as master server, the other is working as slaver server for backup.
主从模式：当一台服务器作为主服务器运行某个应用时，另一台服务器就是备份机。
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