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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,身背父母的期望，贫穷女牧野杉菜（井上真央饰）转入了超级贵族学校英德学院，学生们被奢侈品环绕，上下等级悬殊不说，更让本来就和同学们格格不入的杉菜郁闷的是，学院整个被F4四人组控制，道明寺司（松本润饰）、花泽类 （小栗旬饰）、西门総二郎（松田翔太饰）和美作明（阿部力饰），但凡惹到F4的人都难逃被死整的悲惨命运。某日，实在看不过去道明寺飞扬跋扈的模样，杉菜当场与其起了冲突，翌日便遭到了“红纸条”的报复，危急时刻，杉菜屡屡被花泽类救下，杉菜鼓起勇气向道明寺发起宣战，与崇拜的姐姐椿（松嶋菜々子饰）性情相似的杉菜的不屈不挠在道明寺的心中泛起了微澜，他的心不知不觉被这个如杂草般顽强的女子占据。对冲动鲁莽的道明寺无感，杉菜早已倾心于类，而类真正喜欢的却是藤堂静（佐田真由美饰），剪不断理还乱的爱恨纠葛就此展开。该剧根据耳东兔子的同名小说改编，讲述了优越不羁的校园男神周斯越（陈哲远 饰）与倔强可爱的灰姑娘丁羡（徐梦洁 饰），二人从互相排斥的同桌，在日复一日的相处生活中逐渐发现对方的优点，陪伴彼此度过青春路上的低谷与迷茫，最终彼此成就蜕变的美好青春故事。这条山道正是通往黑木崖，这一行人此行的目的只有一个。情深缘浅...Among them, covering theory, gas theory, endotherm theory and catalytic dehydration theory are usually applicable to cellulose fibers, while droplet theory and absorption of free radicals are applicable to synthetic fiber fabrics.一段君与臣的无间风云，一场秋雨渐浓的相遇。深宫谍变，英雄联盟，相望相杀，相爱却难。