ZooKeeper学习笔记（四）——shell客户端命令操作

ZooKeeper客户端命令行操作

1. 启动服务端

   [simon@hadoop102 zookeeper-3.4.10]$ bin/zkServer.sh start
   

2. 查看状态信息

   Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
   Starting zookeeper ... STARTED
   [simon@hadoop102 zookeeper-3.4.10]$ bin/zkServer.sh status
   ZooKeeper JMX enabled by default
   Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
   Mode: follower
   

3. 启动客户端

   [simon@hadoop102 zookeeper-3.4.10]$ bin/zkCli.sh
   

4. 查看当前znode中所包含的内容

   [zk: localhost:2181(CONNECTED) 1] ls /
   [zookeeper]
   

5. 查看当前节点的详细数据

   [zk: localhost:2181(CONNECTED) 2] ls2 /
   [zookeeper]
   cZxid = 0x0
   ctime = Thu Jan 01 08:00:00 CST 1970
   mZxid = 0x0
   mtime = Thu Jan 01 08:00:00 CST 1970
   pZxid = 0x0
   cversion = -1
   dataVersion = 0
   aclVersion = 0
   ephemeralOwner = 0x0
   dataLength = 0
   numChildren = 1
   

6. 分别创建两个普通节点

   [zk: localhost:2181(CONNECTED) 3] create /simon "user"
   [zk: localhost:2181(CONNECTED) 0] create /simon/a "a"
   Created /simon/a
   

7. 获得节点的值

   [zk: localhost:2181(CONNECTED) 1] get /simon
   user
   cZxid = 0x100000004
   ctime = Thu Oct 24 21:59:31 CST 2019
   mZxid = 0x100000004
   mtime = Thu Oct 24 21:59:31 CST 2019
   pZxid = 0x100000007
   cversion = 1
   dataVersion = 0
   aclVersion = 0
   ephemeralOwner = 0x0
   dataLength = 4
   numChildren = 1
   
   [zk: localhost:2181(CONNECTED) 2] get /simon/a
   a
   cZxid = 0x100000007
   ctime = Thu Oct 24 22:19:10 CST 2019
   mZxid = 0x100000007
   mtime = Thu Oct 24 22:19:10 CST 2019
   pZxid = 0x100000007
   cversion = 0
   dataVersion = 0
   aclVersion = 0
   ephemeralOwner = 0x0
   dataLength = 1
   numChildren = 0
   

8. 创建临时节点

   [zk: localhost:2181(CONNECTED) 3] create -e /simon/temp "temp"
   Created /simon/temp
   

   （1）在客户端可以查看到

   [zk: localhost:2181(CONNECTED) 5] ls /simon
   [a, temp]
   
   

   （2）退出当前客户端之后再重启客户端

   [zk: localhost:2181(CONNECTED) 6] quit
   Quitting...
   2019-10-24 22:22:00,789 [myid:] - INFO  [main:ZooKeeper@684] - Session: 0x26dfe0bc0f60002 closed
   2019-10-24 22:22:00,790 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@519] - EventThread shut down for session: 0x26dfe0bc0f60002
   
   [simon@hadoop102 zookeeper-3.4.10]$ bin/zkCli.sh
   
   

   （3）再次查看根目录下临时节点已经被删除

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

9. 创建带序号的节点

   （1）先创建一个普通的根节点/simon/b

   [zk: localhost:2181(CONNECTED) 1] create /simon/b "b"
   Created /simon/b
   
   

   （2）创建一个带序号的节点

   [zk: localhost:2181(CONNECTED) 1] create -s /simon/b/ba "ba"
   Created /simon/b/ba0000000001
   [zk: localhost:2181(CONNECTED) 2] create -s /simon/b/bb "bb"
   Created /simon/b/bb0000000002
   [zk: localhost:2181(CONNECTED) 3] create -s /simon/b/bc "bc"
   Created /simon/b/bc0000000003
   
   

   如果原来没有节点序号，序号从0开始依次递增。如果原节点下已经有2个节点，则再排序时从2开始，以此类推。

10. 修改节点数据的值

    [zk: localhost:2181(CONNECTED) 4] set /simon/b "B"
    
    [zk: localhost:2181(CONNECTED) 5] get /simon/b
    [zk: localhost:2181(CONNECTED) 5] get /simon/b
    B
    cZxid = 0x10000000b
    ctime = Thu Oct 24 22:23:07 CST 2019
    mZxid = 0x100000012
    mtime = Thu Oct 24 22:26:16 CST 2019
    pZxid = 0x100000011
    cversion = 4
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 1
    numChildren = 4
    
    

11. 节点值的变化监听

    （1）在Hadoop104主机上注册监听/simon节点数据的变化

    [zk: localhost:2181(CONNECTED) 0] get /simon watch    #监听根节点用:get 子节点：ls
    user
    cZxid = 0x100000004
    ctime = Thu Oct 24 21:59:31 CST 2019
    mZxid = 0x100000004
    mtime = Thu Oct 24 21:59:31 CST 2019
    pZxid = 0x10000000b
    cversion = 4
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 2
    
    

    （2）在Hadoop103主机上修改/simon节点的数据

    [zk: localhost:2181(CONNECTED) 0] set /simon "hello world"
    cZxid = 0x100000004
    ctime = Thu Oct 24 21:59:31 CST 2019
    mZxid = 0x100000015
    mtime = Thu Oct 24 22:29:32 CST 2019
    pZxid = 0x10000000b
    cversion = 4
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 11
    numChildren = 2
    
    

    （3）在Hadoop104节点上观察数据的变化的监听

    [zk: localhost:2181(CONNECTED) 1]
    WATCHER::
    
    WatchedEvent state:SyncConnected type:NodeDataChanged path:/simon
    
    

12. 节点的子节点变化监听(路劲变化)

    （1）在Hadoop104主机上注册监听/simon节点的子节点变化

    [zk: localhost:2181(CONNECTED) 0] ls /simon watch
    [a, b]
    
    

    （2）在Hadoop103主机/simon节点创建子节点

    [zk: localhost:2181(CONNECTED) 4] create /simon/c "c"
    Created /simon/c
    
    

    （3）观察Hadoop104主机收到的子节点变化的监听

    [zk: localhost:2181(CONNECTED) 4] ls /simon watch
    WATCHER::
    
    WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/simon
    
    

13. 删除节点

    [zk: localhost:2181(CONNECTED) 6] delete /simon/b/bd
    
    

14. 递归删除节点

    [zk: localhost:2181(CONNECTED) 7] rmr /simon/b      
    
    

15. 查看节点的状态

    [zk: localhost:2181(CONNECTED) 8] stat /simon
    cZxid = 0x100000004
    ctime = Thu Oct 24 21:59:31 CST 2019
    mZxid = 0x100000015
    mtime = Thu Oct 24 22:29:32 CST 2019
    pZxid = 0x100000021
    cversion = 6
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 11
    numChildren = 2