多个服务器在启动时候，会在Zookeeper上创建相同的临时节点，谁如果能够创建成功，谁就为主。如果主服务器宕机，其他备用节点获取监听信息，重新创建节点，选出主服务器。
Last modification：April 4th, 2019 at 10:21 pm
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