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Proxy is a noun and Delegate is a verb. Secondly, proxy shows that several objects implement a common interface, while delegate only shows that one object references another object and does not involve an interface.小喜姑姑笑嘻嘻地对他道。The second method: recovery in case of key failureSentinel (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,抗美援朝战争中，美军调动飞机对我铁路运输进行全面轰炸，妄图夺回战场上的主动权。317路段上中朝官兵冒着生命一次又一次的进行抢修，用自己的生命保证了铁路运输的畅通无阻，保证了我军抗美援朝战争的胜利。洪霖心里腹诽：这是*裸的威胁。不过他相信一点，以铸剑术闻名天下的越国在这方面肯定是有基础的