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3 ", Automatic failure: When a Master cannot work properly, the sentinel will start an automatic failure migration operation, which will upgrade one Slave of the failed Master to a new Master and change the other Slave of the failed Master to copy the new Master; When the client attempts to connect to the failed Master, the cluster will also return the address of the new Master to the client, allowing the cluster to replace the failed Master with the current Master. After switching between Master and Slave servers, the contents of the configuration files of Master's redis.conf, Slave's redis.conf and sentinel.conf will change accordingly, that is, the redis.conf configuration file of Master's master server will have more than one line of slaveof configuration, and the monitoring target of sentinel.conf will be changed accordingly.前田敦子将主演NHK漫改电视剧《传说中的母亲》(伝説のお母さん)！故事脑洞很大，讲述一名曾击败魔王使世界恢复和平的女魔法师，在平静的日子里生下小孩成为家庭主妇，结果魔王复活，她不得不成为兼顾育儿和维护世界和平的魔法师母亲。 该剧共8集，将于2020年2月1日开播。The Y2K problem proves that we are now relying more and more on computer technology in all aspects. In the job market, IT work is undoubtedly the hottest. In fact, many analysts believe that information technology is the most powerful factor that has promoted the strong development of North American economy for a long time since World War II.那位可是小有名气了，福建南平的教谕，能升上来也算有本事。　　AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn: