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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,吃过饭之后，许阿姨说道。很多人死的时候都没搞明白到底是怎么回事？便做了刀下冤魂。The core idea of this pattern is the so-called IIFE (Immediately Invoked Function Expression), which determines the required parameter categories according to the environment.Netflix恐怖/奇幻剧《致命钥匙》宣布续订第2季。《致命钥匙》改编自同名畅销漫画。首季在今年2月上线，聚焦美国马赛诸萨州Lovecraft镇的一座豪宅：讲述父亲被残忍谋杀后，Locke家的三个儿女跟随身有残疾的母亲，住进了父亲那古老的乡下宅子“钥匙屋”。很快，他们发现这间屋子里满是神秘的钥匙，有各种能力，比如实现你的愿望、开启去别的次元的门……同时，有一个恶魔觊觎着这些钥匙，想把它的同伙们带到这个世界中。How to answer such questions? Consistent Zhihu style, the following various statements have, but the top one is actor Zhang Yi's answer (of course, there are reasons why he is a celebrity), but his answer is as follows:故事发生在海滨旅游胜地永平市，它通过碧海旅行社总经理齐凤瑶、永平市最大的旅行社总经理苏江礼、宏海贸易公司总经理曾晖及导游员张婷婷等之间发生的一连串矛盾纠葛，揭示出在社会主义市场经济条件下，多行不义必自毙，惟有诚信待人处事走正道方有好报的道理。