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Classification of documents: engineering specificationsTcpMaxHalfOpen represents the maximum number of half connections that can be processed simultaneously. If this value is exceeded, the system is considered to be under SYN attack. The default value for Win2000 server is 100 and for Win2000 Advanced server is 500.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,故事讲述孤寡大半辈子的丁奶奶含辛茹苦拉扯大的两个独生子如龙、如虎都已过不惑之年。忠厚、善良又有些软弱的建筑工人如虎，为了老母和三个孩子，在妻子死后多年，依然孤身一人照顾全家。(3) The principle of electric time relay is similar to that of clocks and watches. It is delayed by the internal motor driving the reduction gear to rotate. This kind of relay has high delay accuracy and wide delay range (0.4 ~ 72h), but its structure is complicated and its price is very expensive.大苞谷等人骑马，板栗向王穷一抱拳，率众簇拥着郑氏大轿，浩浩荡荡地去了。几颗杏树是近两年新近种植的，并不高大，不过已经是开满了繁华，好不漂亮。