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Sentinel (Sentinel) process is used to monitor the working status of Master master server in redis cluster. When Master master server fails, it can switch between Master and Slave servers to ensure high availability of the system. It has been integrated into redis2.6 + version, and Redis Sentinel mode has stabilized after version 2.8. In general, it is also recommended to use later versions of Redis version 2.8 in production environment. Sentinel is a distributed system. You can run multiple sentinel processes in one architecture. These processes use gossip protocols to receive information about whether the Master master server is offline, and use Agreement Protocols to decide whether to perform automatic failover and which Slave to select as the new Master. Each Sentinel process will send messages to other Sentinel, Master and Slave regularly to confirm whether the other party is "alive". If it is found that the other party has not received a response within the specified configuration time (configurable), it will temporarily think that the other party has dropped, which is called "Subjective Down". English name: Subjective Down, SDOWN for short. Subjective Down,上个世纪30年代，距离南京不远的新南城内，一件离奇的绑架案震惊全市，警察局探长郭亚辉束手无策，在调查中意外遇到了前来新南海光寺修行的高僧慈心。慈心以自己独特的推理法解决了棘手的案子，抓住了幕后真凶，而这一切只是开始。在慈心的身上有一个惊人的秘密，这个秘密涉及了他前世用生命订立的一个契约，而与此同时，黑暗一步步向他逼近，郭亚辉与自己的未婚妻欧阳雪，爱慕慈心的少女陆曼等等被纷纷卷入其中，慈心必须在人情与佛理中进行取舍，唯有抽丝剥茧，保持克制，才能解开谜团，找到真相。然而一切案件的背后，却并不仅仅那么简单，强大的敌人，佛门的教诲、人间的苦难，这些都在一步步改变慈心的信仰与抉择，黑夜过去，黎明仍未到来The modified status is: niu没人会率先撤退，因为现在他们都相信，在调整风帆航向的时候，对方会不遗余力地杀来撞船肉搏。　　在吃醋的快打暗中安排之下，优里在球桌上输掉了好友阿草唯一的财产─撞球间，阿茵也跟着快打回到台北的邵氏集团，正在优里懊悔不已之时，平时就出没在撞球间的断指居然表示，自己有自信教导优里撞球技术，让优里替阿草赢回球场。他身后站着一个黑衣男子，态度非常的恭敬。In our spare time, we will go deep into the grassroots to help farmers do farm work. We will really walk into farmers, understand their voices and their living conditions. At the same time, it is also a combination process of practice and knowledge, and it is our "second classroom".