1. 入门

1.1 介绍

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1.2 应用场景

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2.  Zookeeper内部原理

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2.1 选举机制：先选自己，不够的话投票给id最大的

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2.2 节点类型

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2.3 stat结构体（了解）

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 2.4 监听器原理 

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2.5 写数据流程

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3. 面试

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A服务查询B服务的状态：1.轮询2.主动通知

B把关注的事件注册到Zookeeper，通过Watch作为钩子，事件发生后出发回调函数callback，通知B

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 ZK的作用（分布式协调者）：

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