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No.27 Li QinSentinel (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,刑警周行即将和女朋友陈凯欣求婚的前夕，在警局接获了一起凶杀案的通报。周行赶到山区当场逮捕杀人犯李子建，并发现死者正是陈凯欣。周行强忍震惊与悲痛，与警校的学弟王御泽联手追凶，却发现陈凯欣竟是自愿让李子建杀了她。陈凯欣究竟是自杀还是他杀？就在案件陷入焦灼时，来认尸的家属却告知死者不是陈凯欣，而是一位名叫林静的女子，但没人知道林静为何要冒充陈凯欣。渴望得知真相的周行决定挺身而出，揭开林静留下的重重谜团。本作品以街上的公园为舞台，是一部讲述带着柴犬的三位中年男性喋喋不休的对话剧。在他们的公寓里，有一个共同点。虽然每天散步见面，但是彼此的名字都不知道，以适当的距离感继续交往着。Also known as ice hockey, it originated in Canada and was successively developed in Europe and North America. It was listed as an official event at the 7th Winter Olympics in 1956.山阴绝对是打理的井井有条。