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Defines a one-to-many dependency relationship between objects. When the state of an object changes, all objects that depend on it are notified and automatically updated.沙加路说过很多次，东方人是可怕的敌人，不要再犯下惹怒他们的错误。天黑了？吕馨一伸手，发觉手臂酸痛无比，手指头就像是被针刺了一样。下邳在彭城以东，秦嘉为抵抗项梁在彭城以南布置了绵长的防线，张良等人想要传过来并不容易。Author: Zhihu UsersThere 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.该片讲述了在未来地球灭亡之际，人类面临世界末日所发生的三段奇特而荒诞的故事。