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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,Black scale mobeni黄豆白了山芋一眼，怪他多事，说道：咱们都这么大了，还玩那个？现放着几个当官的哥哥姐姐，都是拿俸禄的，这付账的事还用咱们操心？板栗立即道：我们拿俸禄，跟你什么相干？黄豆争辩道：咋不相干了？这要是传出去，说玄武侯让没进项的弟弟妹妹请他吃羊肉，你这脸往哪搁？板栗一拍桌子，怒道：我不要脸了成不？众人先是一愣，接着大笑不止。板栗急忙道：我吃过饭就要跟爹说的，爹总也没空，就耽搁了。厢房前面有条走道，可以通向厅堂。1931年，由于蒋介石政府的不抵抗政策，东北三省沦陷。激起全国民众的愤怒，抗日情绪空前高涨，学生们聚集政府门前抗议示威。张治中将军虽奉命前去平乱，但以真诚打动学生，并保证战事一旦扩大，必亲赴沙场抗击暴日。同时，张治中接到何香凝寄来的女人衣服和诗，这更激励张治中决心面见蒋介石，力谏蒋出兵，并要求亲自带兵抗日。出兵前，张治中写下遗书。华氏一家四口所住的屋村，一直是全港自杀率最高的地方，到处鬼影幢幢，与人却是相安无事。但自华冠东(古宇饰)从长洲回来后，怪事却接踵而来，弟弟冠南(张致恒饰)与冠东的女友Charlie(蒋雅文饰)明查暗访下发现一切源于一张古旧钞票。同时间，冠南暗恋的美芝(汤怡饰)因一次热心助人，竟惹来村内可怕恶灵－村长的骚扰。眼见身边亲人屡遭侵害，生命危在旦夕。自少能与亡灵沟通的冠南，顿成为对抗村长与拯救哥哥的唯一希望。为救冠东与美芝，冠南不惜一切与恶灵对抗！一夜间，村内顿成阴阳两界的杀戮战场……