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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,他今晚也就是这么一说，算是立志。周杰伦的朋友全情参与，方文山、刘德华、五月天、萧敬腾、林俊杰、谢霆锋、陈建州等将和周杰伦一起周游世界，每个城市一首周杰伦歌曲，全程无脚本拍摄，周杰伦全程参与，魔术技能大秀，去巴黎解码《告白气球》，去新加坡看林俊杰《听妈妈的话》，和谢霆锋富士山下看《最长的电影》。Come on, come on, come onIntroduction: Korean clothing expression. Usually used when the owner is expected to increase the speed of the game.当一名家庭顾问的前妻试图与他们的儿子和新男友一起移居该国另一端时，他决定采取一切必要措施以防止这种情况发生。要在奉州操练一月，才会拉上战场。