# ZooKeeper基本数据模型

## 介绍

ZooKeeper是一个树形结构，类似于前端开发中的tree.js组件。

ZooKeeper的数据模型也可以理解为linux/unix的文件目录：/usr/local/...

每个节点都称为znode，它可以有子节点，也可以有数据。

每个节点分为临时节点和永久节点，临时节点在客户端断开后消失。

每个ZooKeeper节点都有各自的版本号，可以通过命令行来显示节点信息。

每当节点数据发生变化，那么该节点的版本号会累加（乐观锁）

删除/修改过时节点， 版本号不同匹配则会报错。

每个ZooKeeper节点存储的数据不宜过大，几k即可。

节点可以设置权限acl，可以通过权限来限制用户的访问。

![](/files/-LfnTMIoqw-LdxQIWNUl)

参考资料：

[ZooKeeper系列之二：ZooKeeper数据模型、命名空间以及节点的概念](https://blog.csdn.net/shenlan211314/article/details/6170731)

[Zookeeper数据模型及其应用](https://www.cnblogs.com/wxisme/p/6085501.html)


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