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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.Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:Once so in love with each other, now only disgust remains. At the time of divorce, the ground was covered with torn cheeks, ugly and rude.1898年，晚清中国，戊戌变法失败“六君子”被捕。霍元甲得到消息后如晴天霹雳。深受“六君子”爱国热忱感染的霍元甲，欲拼尽全力和江湖传奇“大刀王五”一起营救谭嗣同，却不想遭到谭嗣同拒绝。与谭嗣同在狱中的最后一别，让霍元甲深受谭嗣同大同思想的影响，开始萌生家国情怀，想要投身到历史洪流之中。…………………………………………………………………得到汉齐梁三国联军撤退的消息，尹旭淡淡一笑，完全都是意料之中的事情。It is also because the public has prejudice against weightlifting, and it is not possible to change this prejudice in a day or two, which also makes it difficult to select weightlifting materials. Liu Eryong came to Qingdao Weightlifting Team in 2003, As a coach for 15 years so far, He still sighed with emotion and said: "For so many years, there have been almost no children in Qingdao City to practice, even in Laoshan District. We have selected talents from Pingdu, Laixi, Jimo and other surrounding districts and cities. Even so, we have a good view of ten athletes, have to communicate with parents and do work with children, and finally we can come to five or six, which is even good." Speaking of which, Liu Eryong showed a wry smile.拥有一个世界的积累，陈启才是武侠小说权威中的权威，之前刻意沉默，只是为了引侠客文化上钩，并不是代表他不介意被诬蔑，现在被还清白，他才不会息事宁人。