Zookeeper客户端命令行操作

1. 启动客户端

   [codecat@hadoop103 zookeeper-3.5.9]$ zkCli.sh
   

2. 显示所有操作命令

   [zk: localhost:2181(CONNECTED) 0] help
   

3. 查看当前 znode 中所包含的内容

   [zk: localhost:2181(CONNECTED) 0] ls /
   

4. 查看当前节点详细数据

   [zk: localhost:2181(CONNECTED) 2] ls -s /
   

5. 分别创建 2 个普通节点

   [zk: localhost:2181(CONNECTED) 3] create /sanguo "jinlian"
   Created /sanguo
   [zk: localhost:2181(CONNECTED) 4] create /sanguo/shuguo "liubei"
   Created /sanguo/shuguo
   

6. 获得节点的值

   [zk: localhost:2181(CONNECTED) 5] get /sanguo 
   jinlian
   

7. 创建短暂节点

   [zk: localhost:2181(CONNECTED) 7] create -e /sanguo/wuguo "zhouyu"
   

   • 在当前客户端是能查看到的

     [zk: localhost:2181(CONNECTED) 8] ls /sanguo 
     [shuguo, wuguo]
     

   • 退出当前客户端然后再重启客户端，再次查看根目录下短暂节点已经删除

     [zk: localhost:2181(CONNECTED) 0] ls /sanguo 
     [shuguo]
     

8. 创建带序号的节点
   • 先创建一个普通的根节点

     [zk: localhost:2181(CONNECTED) 1] create /sanguo/weiguo "caocao"
     Created /sanguo/weiguo
     

   • 创建带序号的节点

     [zk: localhost:2181(CONNECTED) 2] create -s /sanguo/weiguo/xiaoqiao "jinlian"
     Created /sanguo/weiguo/xiaoqiao0000000000
     [zk: localhost:2181(CONNECTED) 3] create -s /sanguo/weiguo/daqiao "jinlian"
     Created /sanguo/weiguo/daqiao0000000001
     [zk: localhost:2181(CONNECTED) 4] create -s /sanguo/weiguo/diaocan "jinlian"
     Created /sanguo/weiguo/diaocan0000000002
     

     如果原来没有序号节点，序号从 0 开始依次递增。如果原节点下已有 2 个节点，则再排序时从 2 开始，以此类推
9. 修改节点数据值

   [zk: localhost:2181(CONNECTED) 5] set /sanguo/weiguo "simayi"
   

10. 节点的值变化监听
    • 在 hadoop104 主机上注册监听/sanguo 节点数据变化

      [zk: localhost:2181(CONNECTED) 1] get -w /sanguo 
      

    • 在 hadoop103 主机上修改/sanguo 节点的数据

      [zk: localhost:2181(CONNECTED) 6] set /sanguo "xisi"
      

    • 观察 hadoop104 主机收到数据变化的监听

      WATCHER::
      WatchedEvent state:SyncConnected type:NodeDataChanged path:/sanguo
      

11. 节点的子节点变化监听（路径变化）
    • 在 hadoop104 主机上注册监听/sanguo 节点的子节点变化

      [zk: localhost:2181(CONNECTED) 4] ls -w /sanguo 
      

    • 在 hadoop103 主机/sanguo节点上创建子节点

      [zk: localhost:2181(CONNECTED) 7] create /sanguo/jin "simayi"
      

    • 观察 hadoop104 主机收到子节点变化的监听

      WATCHER::
      WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/sanguo
      

12. 删除节点

    [zk: localhost:2181(CONNECTED) 8] delete /sanguo/jin
    

13. 递归删除节点

    [zk: localhost:2181(CONNECTED) 9] deleteall /sanguo/shuguo
    

14. 查看节点状态

    [zk: localhost:2181(CONNECTED) 12] stat /sanguo