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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,After reading these, I really feel that ghosts are not terrible, but people are the most terrible.不管怎样，田翰林长大了，该告诉他的，都应该告诉他。但是紫月剑和紫月剑的粉丝还没有高兴几天，就发现一个悲剧的事实。《九星天辰诀》讲述了男主角叶辰因一把神奇的飞刀穿越到异世大陆，突破重重艰难险阻，最终参悟了至高心法“星衍飞刀”及练气法门“九星天辰诀”，成为生命祖神的故事。同名网剧以主角叶辰的视角，辅以爱情元素为佐料，用无厘头的方式表现出了他在除妖之路上发生的一幕幕啼笑皆非的桥段。A man opened more than a dozen numbers. The city layout inside was exactly the same, all of which were Grade 98. He sold wood and sugar, as well as micro-signals, monopolizing the trade center.