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Sentinel (Sentinel) process is used to monitor the working status of Master master server in redis cluster. When Master master server fails, it can switch between Master and Slave servers to ensure high availability of the system. It has been integrated into redis2.6 + version, and Redis Sentinel mode has stabilized after version 2.8. In general, it is also recommended to use later versions of Redis version 2.8 in production environment. Sentinel is a distributed system. You can run multiple sentinel processes in one architecture. These processes use gossip protocols to receive information about whether the Master master server is offline, and use Agreement Protocols to decide whether to perform automatic failover and which Slave to select as the new Master. Each Sentinel process will send messages to other Sentinel, Master and Slave regularly to confirm whether the other party is "alive". If it is found that the other party has not received a response within the specified configuration time (configurable), it will temporarily think that the other party has dropped, which is called "Subjective Down". English name: Subjective Down, SDOWN for short. Subjective Down,他不敢擅入，派人来叫大哥。1. Restrict information disclosure从谎言开始的爱情/谎言开始的恋爱/谎言是从恋爱开始的故事讲述27岁的葛西莉子被交往10年的男友欺骗，婚约被解除，为了寻找能带给自己幸福的人，她从青森搬到东京，住在表妹篠原友里（的家，为了遇上好男人，她们二人到银座的热门地点流连，方法只靠搭讪指南书。终于有一名小狗系的男子泉晴彦过来搭讪，对方表示想借她们3分钟，只因为他的前辈要他这样做。他的巧言成功让她们跟随，等待着的是在大公司工作的都市男鸭下淳之介（。他们一起喝酒，莉子多喝两杯就开始用津轻方言大数前男友的不是，接着友里和晴彦都离开，剩下他们二人。　　《小鬼当家》。两个冷血笨贼入室洗劫，三个大男人奉行不抵抗政策，被绑成粽子；俞白眉临阵叛变；危急关头，10岁方舟小鬼当家，设下天罗地网……Relying on automatic loading, the configuration is clear and concise.