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The choice of stars should pay attention to the star's own image, affinity, credibility, professionalism, popularity and other factors.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,英布淡淡道：越王说笑了，九江国已经不存在了。香荽鼻子里轻哼一声，不屑道：除了装女娃就没别的法子了？大苞谷气得晕了头，完全被她牵着鼻子走，大喊道：什么法子？我还能躲在粪桶里？那不是更让你们笑掉大牙。During this period, all the people present registered the investment information and list, and several of my investor friends, I also entrusted Dahei to help register:The lack of money by the poor seems to be due to insufficient resources. In fact, the most deadly thing is the mentality of the poor. In other words, the poorer you are, the more you care about money, the more you care about money, the more you affect your vision and pattern. Without understanding this, many things and plans are out of the question.