ZAB协议-zk

参考文章： http://www.javashuo.com/article/p-qjvyoeuz-t.html https://blog.csdn.net/wangyangzhizhou/article/details/52698555 https://blog.csdn.net/yangguosb/article/details/80254240   zk中使用的是ZAB协议，ZAB（ZooKe

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