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The pins on the PCB are dual-column or multi-column components and the layout direction of multiple discrete components regularly arranged should be as consistent as possible and toward the direction of the PCB under design in the production line, as shown in the following figure: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.(1) Two vertical ring lamps, green at the top and white at the bottom, or a number consisting of two cones vertical at the top and bottom and butted at the tip;在一个以昆虫为主的后世界末日的废墟中，一只有感知力的蟑螂发现了被遗忘的《氰化欢乐秀》VHS录像带，从而揭开了最疯狂的一季。本季将在一个满是古怪角色的荒谬宇宙中，探索大家都在问的问题，以及一些无人问津的问题多年前一段纯真的友谊，多年来尘封已久的恩怨，铺展开全新的生命版图。李心兰和李柏杉姐弟一夜之间成为孤儿，被父亲的好友——商人刘力伟收养。而刘的妻子碧芬却因为早年的纠葛，处心积虑地拆磨这两个孩子，柏杉也被迫送往国外。刘力伟的儿子刘克谦与心兰渐渐萌发了爱意，愤怒的碧芬全力拆散，二人离家出走，不料发生了意外。离开刘家的日子里，心兰咬紧牙关，自食其力。其间，遇到了青年才俊张君华，君华开朗、善良，但……不过这些决计不能让属下们看见，否则他们会更加担忧，没有了足够的信心。他们都是铁骨铮铮的汉子，跟个女人计较，像什么样子？这黎章好容易在军中挣得些威名，一朝身份败露，担心袍泽非议她，也是人之常情，但不知她要如何在众军面前分说。