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There must be an objective downtime. When most Sentinel processes in the "Sentinel Group" make SDOWN judgment on the Master master server and communicate with each other through the SENTINEL is-master-down-by-addr command, the Master Server offline judgment is obtained. This method is "objective down", and the English name is: Objectively Down, abbreviated as ODOWN. Through a certain vote algorithm, select one of the remaining slave server nodes to be promoted to Master server node, then automatically modify the relevant configuration and turn on failover.小娃儿们更不用说，他们最喜欢这样的热闹。在淮水一带激战三个月，最终以九江军的失败而告终，龙且凭借自己的勇猛和西楚国强大的兵力一句攻克九江郡，英布战败。蜜蜜是一只活泼可爱,古灵精怪的小猫咪，温柔的妈妈、有趣爱运动的爸爸、还有淘气调皮的弟弟乐乐，他们是快乐的一家人。故事主要围绕蜜蜜的日常生活进行展开。 同时让小朋友了解是爸爸妈妈在生活的点滴中传授经验，让孩子们在爱中懂得分享与感恩，在游戏中学会探索与思考。　　老舍名著张国立邓婕等主演《我这一辈子》四大看点 　　　《新圣水湖畔》是由山西作家影视艺术制作有限公司出品的当代农村剧，原名《湖畔新村》。在党中央富民政策的指引下，湖西村的生产发展了，农民也富了起来，被县里定为了小康示范村。村党支书黄金贵想用村里的一笔结余款在湖西上建立一座“星级”的“水上乐园”来招引更多的旅客，从而增加收入，安排村民就业，使村民们都富起来。B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).