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Let's first list a column in life to illustrate the following command mode: For example, we often buy things on Tmall. Then place an order, I want to receive the goods after placing the order, and hope that the goods are true. For users, it is not concerned about how the seller delivers the goods after placing the order. Of course, the seller also has time to deliver the goods, such as delivering the goods within 24 hours. Users do not care about who the express delivery is to, and of course some people will care about what the express delivery is. For users, it is only necessary to deliver the goods within the specified time and generally receive the goods within a considerable time. Of course, the command mode also includes cancellation orders and redo orders. For example, after we place an order, I suddenly don't want to buy it. I can cancel the order or place the order again (i.e. Redo the order) before delivery. For example, I took the wrong size of my clothes. I cancelled the order and took a larger size again.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.2009.1-20世纪少年：第二部 最后的希望两个不同家族的儿子从小订婚了。一个不想要包办婚姻，一个想把他争取过来！References: