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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,这时刚好一帮流氓前来找茬，胜浩起先远远地观望，但看到一帮人对其父亲痛下狠手时，终于忍不住上前出头.结果寡不敌众也被打了一顿，手机也被摔坏了.最后两人仓皇逃跑，巧妙藏身才逃过一劫，由此也成为了朋友.前一世，即使再困难再迷茫，陈启也没有放弃过拼搏，这一生有了前所未有的优势，他只会更加努力。保安队悬赏巨额花红捉拿大盗胡良（唐伟成饰），穷小子皮球（汪禹饰）爱钱又好赌，想拿到这笔花红，先后带“灵蛇大侠”包扬天（刘家荣饰）、“独孤一味”叶孤行（徐少强饰）前去与胡良决斗，以图捉到胡良，没想到两位高手全被胡良打死。皮球在好友小梅（黄杏秀饰）的鼓励启发下，勤心苦练，模仿鳝鱼在水中游泳的姿势，练出一套奇异的拳法“鳝形拳”，又凭借智计和耍球绝技，终于打败胡良，为朋友报了仇。但皮球最后还是没有得到这笔花红，反而还欠保安队长（麦嘉饰）五块钱……