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There must be an objective downtime. When most Sentinel processes in the "Sentinel Group" make SDOWN judgment on the Master master server and communicate with each other through the SENTINEL is-master-down-by-addr command, the Master Server offline judgment is obtained. This method is "objective down", and the English name is: Objectively Down, abbreviated as ODOWN. Through a certain vote algorithm, select one of the remaining slave server nodes to be promoted to Master server node, then automatically modify the relevant configuration and turn on failover.樱花飞舞的四月，当初因某种原因转到马路须加女子学园的前田敦子（前田敦子 饰）升入三年级，而她和京八桥（横山由依 饰）、洋兰（宫泽佐江 饰）、激辣（松井玲奈 饰）、尺（峯岸南 饰）所在的喇叭叭也迎来了新的狂风暴雨。鼠女（渡边麻友 饰）与Center（松井珠理奈 饰）沆瀣一气，联手向站在马路须加顶点的前田发起冲击，而本已签订停战协定的老对手矢场久根学院，竟在原四天王之一的涉谷（板野友美 饰）的带领下气势汹汹向马路须加袭来。本剧讲述了扮演富二代的男主角与保镖的女主角在家庭遗产纠纷中所发生的爱情故事。System.out.println ("build the tree finished! ");　FOX宣布续订《驻院医生 The Resident》第五季。The adapter pattern of the object is the origin of various patterns. Let's look at the following figure: