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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,Introduction: When using this expression, it will make a low whisper to show "shyness".Name:当年可是连京都有名的铁嘴讼师都败在他面前。Advantages: Delayed loading (loading only when needed)50年代的德国,驻扎于Kaltenstein（冷石）的美军带来了崇尚个人自由主义的风气,因此两种文化开始猛烈的冲撞。。。现在刘邦有些明白了，尹旭为什么那么大方将韩信送给自己，人家是有先见之明啊。