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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,Public User getUser2 () {挺身上前，一边细看来人。送信的张功曹未归，陈奎必然心生警戒，邀请赴宴多半只是试探。　　医院里凌副官看到行动队长许尔根带人闯了进来，偷偷将一个美式烟盒放到了少诚的口袋里。许尔根将少诚和凌辉带回军统站审讯。叶司令的女儿叶眉在军统站做机要员，她得知少诚救了共党潜伏在司令部的特工凌辉，持枪闯进审讯室，要枪毙少诚，被陈剑锋劝住。洛基•巴尔博厄(西尔维斯特•史泰龙 Sylvester Stallone 饰)战胜了世界冠军拳王阿波罗，却很快花光了比赛赢得的奖金。为了养家糊口，他尝试了很多的工作，均未成功。他再三考虑，决定做回本行，重新开始他的拳击生涯。　　在这些任务的执行过程中，苏琳渐渐爱上了孙志扬——这个注定最终战死的男人。苏琳开始想尽一切办法，努力改变历史，让孙志扬活下来。