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鲁三不得不承认。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,葫芦也走出来，盯着白凡沉声道。一路冥思苦想之下，他决定取长补短。叶枫和路上相识的画家年华俩人开始了艰难的旅程。在丈夫埃文回到阿贝科伦，看到妻子在史蒂夫·巴尔迪尼的怀抱中18个月后，我们又回到了费斯·豪厄尔斯的故事。埃文把费思拉进了一个黑暗而危险的世界，她仍在付出代价。　退休护士长丁香香早年丧偶，丈夫的师弟马大宽默默帮衬着她支撑着施家的大小事务。两个儿子已结婚生子，唯独让她头疼的是大龄女儿施如的婚事。丁香香想方设法为女儿征婚相亲，没想到给女儿征婚时偶然和外籍专家瑞尼的邂逅，却给自己带来了桃花运。马大宽生怕丁香香被抢走，终于打破沉默向香香展开了自己的爱情攻势；被丁香香救过命的鲁鹤年也被丁香香的魅力和善良打动。三个男人向丁香香发起的爱情攻坚战让丁香香措不及防。丁香香一边面对着儿女争房产、朋友住院等头疼事，还要饱受爱情带给她的压力。孩子们的不同意见，几个家庭的矛盾纠葛，中西文化的各种差异，世俗观念的各色目光描绘出一幕幕悲喜交加的生活画卷。退休老人们的责任，执着，真诚，大爱、善良打动着所有人的心。