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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,南宋年间，通古县前任县令为了一己私利，利用“河神”为幌子暗中掳掠儿童，百姓惶惶不安，在其蛊惑下纷纷相信用孩童祭祀“河神”可以平息灾祸。宋慈受命来到通古，向百姓一再申明祭祀河神纯属无稽之谈，并保证一定会查出事情真相，他的到来使得老县令感觉到了威胁。在老县令的授意下，其党羽对宋慈阳奉阴违，并暗中施以压迫，企图神不知鬼不觉的将宋慈了结。在一波接一波的危险降临在宋慈身上时，孩童还在不断失踪，这使得老百姓对宋慈失去了信任，逼宋慈赶紧祭河神。宋慈顶着多方的压力，抽丝剥茧地调查，利用自己高超的法医学手段让尸体“开口说话”，逐渐锁定了真凶，并发现了背后的巨大阴谋。最终，宋慈不惜以性命相搏将真凶绳之以法。Stance socks range in price from 80 to 90 to more than 200, so you can go to the official website to choose them yourself.On April 21, holding the attitude of testing, I made an appointment with my little partner to wear the product and went up the mountain, completing a total of 44.77 kilometers, lasting nearly 11 hours, with a cumulative altitude rise of 2823 meters.国术，只杀敌，不表演。