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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,Understand the basic principle of using single mode to realize pop-up window.儿子的意思他自然明白，可是，他不是应该把这心事对他娘说，或者跟他菊花姑姑说么，咋跟他这个言语不多的爹倾诉了哩？看着跟自己一样沉默寡言的大儿子，从牙牙学语长到跟自己一般高，看这情形只怕还要超过自己，如今也晓得求取想要的了。秦旷道：香儿妹妹不急，我明天再来找你……香荽摇头道：秦哥哥，你是皇孙，不要随便往我们商户这里来，让人看见了说你。91.01.10~91.12.12(木)Multiple can hit the head, but it really doesn't start automatically.要是想和我离得近一点，你也可以搬来燕京……你健康快乐，是我最大的幸福……听着陈启的话，陈文羽眼睛湿润起来，然后很快便开怀大笑。