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Objectively Down (ODOWN for short) refers to the judgment of server offline obtained by multiple Sentinel instances after making SDOWN judgment on the same server and communicating with each other through SENTINEL is-master-down-by-addr command. (One Sentinel can ask another Sentinel if the given server is considered offline by sending the SENTINEL is-master-down-by-addr command.)Here we seem to simulate the process of a collection class, does it feel great? In fact, each class in JDK is also these basic things, plus some design patterns and some optimization. As long as we learn and master these things, we can also write our own collection classes and even frameworks!The only use of * * is probably that I can't remember the name of the medicine when writing the plot of the Potions lesson * *WeChat web page version, connect keyboard, quickly enter WeChat life./gaze太不可思议了。