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In the last article, we explained Redis' master-slave cluster mode in detail. In fact, the configuration of this cluster mode is very simple. It only needs to be configured on Slave's nodes. The configuration of Master's master node does not need to be changed. However, one thing is that the persistent configuration of Master and Slave nodes should be consistent as far as possible, otherwise there will be strange problems. Starting today, we will begin to talk about the second mode of Redis cluster mode. That is, the "Sentinel" mode, which was provided from version 2.6 of Redis, but the mode of this version was unstable at that time. The Sentinel mode did not stabilize until version 2.8 of Redis. In the production environment, if you want to use the Sentinel mode of Redis, you will try to use the version after version 2.8 of Redis. Whether it is master-slave mode or sentinel mode, both modes have a problem and cannot be expanded horizontally, and the high availability of these two modes will be limited by the memory of Master master node. Another point is that the configuration of Sentinel mode is not simple or even complicated, so neither mode is recommended in industrial scenes. If you want to use it, you must have solutions to related problems to avoid subsequent problems.Founder of Touching Socks基特是一个模范学生，他将获得奖学金去国外学习。但问题出现了，奥兰通知基特和其他4名学生将不会获得奖学金。解决这个问题的唯一方法是他们所有人必须聚集起来组成一个乐队来代替老学校乐队比赛。于是，基特召集了塔姆、法朗、陶、奇和方。他们对赢得比赛没有信心，他们面临各种各样的障碍，但本老师总是在那里帮助鼓励他们。所以即便是自己不动手，也会有其他人代劳，这个人选无疑就是英布了。芭比的处女作《芭比与胡桃夹子的梦幻之旅》 (Barbie in the Nutcracker) 胡桃夹子的梦幻之旅　风靡全球40多年的芭比娃娃给人们最深刻的印象莫过于光彩的倩影，曼妙的身材和恬静的脸庞，这个可爱的洋娃娃身穿不同国籍、不同款式的时尚服装，静静地呆在那里等待着自己的主人。在2001年芭比娃娃却一改往日静止不动的样子，突然动了起来。一直为千万女孩渴望拥有的芭比娃娃正式进军影坛，推出她的处女作动画影片《芭比与胡桃夹子的梦幻之旅》（Barbie in the Nutcracker）这是一部长75分钟的动画片，是专门为少女和小女孩们设计的。本片通过最先进的CGI电脑动画制作技术，全新演绎霍夫曼的名著《胡桃夹子》，片中芭比饰演女主角嘉娜，她收到胡桃夹子送给她的一份精致的生日礼物，当晚进入梦乡时，邪恶的恶鼠王企图闯入并下了可怕的咒语，胡桃夹子为了保护...What are the advantages and disadvantages of OvO and OvR?