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作为一个来到陌生文明的外星人，她听说地球人身上隐藏着一种古老而强大的力量，“神奇之力”。只有学习了这些“神奇之力”才能帮助她在这个星球生存下去、找到父亲。但她并不知道这力量究竟是什么，于是，通过她高超的学习能力与“模仿”的超能力，不断模仿她所看到的“有力量”的人和事物。　　但是突然有一天，男人发现自己一头乌黑的头发开始脱落，平时健康的牙齿也变得有问题，连眉毛都在掉，医院的检查结果居然是砒霜中毒。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,三人大惊，接过信件齐齐拜读。她的诙谐逗笑了众人，加上她认定葫芦没事，秦淼顿时觉得精神百倍——菊花婶婶跟她想的一样。