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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,乔氏总裁乔霖妹妹乔思思的意外去世，其妻子白晨被列为怀疑对象被乔霖百般折磨，白晨因无法忍受乔霖的诬陷而选择离开了他。在她最无助的时候，夏之航像寒冷冬日里的一抹曙光出现在她身边，无微不至地照顾她、帮助她，让她倍感温暖。夏之航与乔思思曾是恋人关系，他相信白晨不会是杀死乔思思的凶手，两人携手查凶，与此同时，白晨的妹妹白雨因喜欢乔霖，一直暗地里清除她和乔霖之间的障碍……Three handshakes.他们还不相信，说辣妹……小的该死。各种忙碌的工作小故事往常那些有钱人家夫人被治愈后，总是喜欢说一大篇不要钱的感谢话儿。