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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,The above is the specific process of three handshakes. Seeing here, you may have a question. Usually we only call when establishing a connection with the server, and we do not shake hands three times. In fact, this high-level concept is an abstraction of the three-time handshake, and its concrete implementation completes the three-time handshake process.最后，月下的宽带于下午已经安装好了，多谢大家关心。许文强，热血爱国，因参予学生运动而被捕下狱。出狱后，转而追求名利，立志出人头地。强无意被卷入一黑帮火并，被头目罗致加入，亦因此结识了在贫民区长大的丁力，两人结成好友，并同在黑道中闯出名堂。后因缘际会，为叱上海黑白两道的冯敬尧之女冯程程解围，后加盟冯的集团，成为黑道中炙手可热的人物。另一方面，程程对许文强一见倾心，但许文强恐负累佳人，虽深爱却未表露。双方的保留，不只令两人遗憾终身，同时更引出二人与丁力之间的一段错综复杂而又刻骨铭心的三角恋情。Fabric immersed in dyed leaf juice小人发誓，绝没看见人，什么也没有，那童大发就滑下水了。This product is guaranteed by the whole country and enjoys three guarantees service. The warranty period is: 3 months.