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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,　　CW台一口气宣布续订旗下10部美剧，刚刚庆祝播出300集的《邪恶力量》续订第15季，收视稳定的超级英雄系列剧集《绿箭侠》（第八季）、《黑霹雳》（第三季）、《明日传奇》（第五季）、《闪电侠》（第六季）、《女超人》（第五季）毫无悬念获得了新一季的续订。他说不走自然就不走了。在他们迷失在另一个维度之后，拉泽团队再次联合起来对抗新的威胁。Private Command command;