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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,Press Page Down to lower the propulsion and slow down the plane.一部催人泪下、感人至深的情感剧。——真正中国版《蓝色生死恋》。　　十九岁的朱惠云，其父是大学教授，后到省文化厅工作，“文革”中被迫害至死。无依无靠的朱惠云由妈妈介绍，从省城嫁到灵山县焦家庄。新婚之夜，惠云便受到村革委会副主任王向东的欺辱。王向东为染指朱惠云，未出蜜月，便派惠云的丈夫焦满仓和她的公公焦贵林去修渠……　　悲惨的命运几乎将朱惠云击垮，但外柔内刚的朱惠云挺了过来，她拖着病躯上访告状，当她得知自己患了胃癌，并没有停下来，硬是在担架上战胜了腐败势力，王向东和县长儿子终于得到了应有的惩治……　　最后朱惠云和焦满仓平平和和地离了婚。朱惠云在她人生旅途的最后几步获得了幸福，她和满山结合了。Single-player scourge flow, A injury has the power of heaven-20%, Holy Mission +10%, Yang Ku +25%, Lux +30%, Shoulder and Breastplate scourge +30%, totaling 45%Namespace. ? In JavaScript, if a variable is declared outside the top-level function, it becomes globally available directly. As a result, naming conflicts often occur accidentally. Using modular development to encapsulate variables can avoid polluting the global environment.二更求粉。