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The high loyalty of the program audience will be closer to the young audience in the future.Visitor pattern is suitable for systems with relatively stable data structures. It disconnects the coupling between data structures and operations acting on structures, allowing the set of operations to evolve relatively freely.Beijing大家是都在期待《倚天屠龙记》出现神转折，但是尼玛，你的转折也不能这么神啊……难道现在流行男主角拖家带口？武侠小说上也要出现萌娃，来吸引大妈大爷阅读？坐等下一期的连载。There is something to say to Tou Jun: The rights protection of the Tou Family is still relatively mild and the progress is relatively obvious. According to August 3, the Tou Family has been recovered by the police by 81 million yuan. This is good news for investors, although the amount is not large.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.