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Usage scenario: Combine multiple objects together for operation, which is often used to represent tree structures, such as binary trees, numbers, etc.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,就在这时，忽地听见一声板栗哥哥的遥唤，令他一震，忙加大手中的力量，拼死将蛇头往眼前拉，嘴也将刀往前送。　　四个不同的极点——Nick(Pon饰)、Wan(Mo饰)、Beam(Patricia饰)和wayu(God饰)——不断地相互环绕，在碰撞的火焰中反复碰撞和燃烧。20岁的废柴大学生——木之下和也。和初恋女友仅接吻了一次，可只过了一个月就被甩了。/nosepick (sniffing)为父今晚就托人寻个浆洗煮饭的婆子来，往后你也不用洗衣煮饭了，也去张家私塾就学，跟黄豆他们一处读书。