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4. There is a overtime phenomenon in the business (the occurrence rate is also very high, but the customer has used it too much)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,《铁杉树丛》根据布莱恩麦克格瑞卫（BrianMcGreevy）同名名恐怖小说改编，主要黑暗的奇事、青春期的欺骗和贪婪的关系为背景，探讨了怪物的本性。《精灵宝可梦》（ポケモン）是由汤山邦彦执导的电视动画系列，改编自精灵宝可梦系列游戏。