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Public void update () {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,由庵野秀明的Khara工作室与Nico动画母公司Dwango共同举办的“日本动画（人）博览会”，这部动画集结了大批优秀动画人完成，这些动画人基本都和庵野秀明有联系，也被称为“庵野军团”。这个栏目旨在推出一批试验性质的动画，每个片子都不一定有完整自洽的情节，或者去解决一定的问题。但项羽全不以为意，认为天下几乎就在自己手中，刘邦即便进了咸阳也不打紧。In the course of practice, Teacher Sun Yimin said more than once, "I hope our practice can make more students pay attention to employment and entrepreneurship. "There are priorities in learning and specializing in technical fields". Everyone's value is often reflected in different aspects. We should find our own way and direction instead of blindly following the principle of postgraduate entrance examination. Industry is also the top priority of the country's development. Investment in industry can also achieve a career! " As a retired old teacher, Mr. Sun, who was supposed to live a leisurely life at home, was still able to stay far away from the "Jianghu", worried about his "monarch" and still chose to devote himself to student work. Such a mind is really admirable!　　隐藏自己的疾病度过日常的樱良，与知晓其秘密的“我”。张家平反你得来报信啊，却怕死不敢来。