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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.英梨梨和诗羽为了开发大作游戏《寰域编年纪》而前往人气创作者红坂朱音之处。blessing software的代表伦也继续社团活动，和副代表惠一起开始了新作的开发。他起用在做插画师的学妹·波岛出海，向身为制作人的出海之兄·伊织发出委托，和冰堂美智留及其乐队icy tail一同推进着新作的开发，然而……。是这样。在Jane Villanueva（Gina Rodriguez）还是个小女孩的时候，她的外祖母告诉她两件事：长篇爱情肥皂剧是最高级的娱乐形式，女人必须不惜一切代价保护自己的贞洁。Graduated from preschool normal education or above. Non-kindergarten teachers' major graduates need a college degree or above to apply.What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.For the first-class qualification certificate of the fire safety assessment institution to be issued, the fire control institution of the provincial public security organ shall complete the examination within 20 days from the date of accepting the application, and submit the examination opinions and application materials to the fire department of the Ministry of Public Security. The Fire Department of the Ministry of Public Security shall complete the review within 10 days from the date of receiving the review opinions.