Zookeeper 客户端命令行操作

客户端命令行操作

命令基本语法	功能描述
help	显示所有操作命令
ls path	使用 ls 命令来查看当前znode的子节点 -w 监听子节点变化 -s 附加次级信息
create	普通创建 -s 含有序列 -e 临时（重启或者超时消失）
get path	获得节点的值 -w 监听节点内容变化 -s 附加次级信息
set	设置节点的具体值
stat	查看节点状态
delete	删除节点
deleteall	递归删除节点

1）启动客户端


[hadoop@hadoop103 zookeeper-3.5.7]$ bin/zkCli.sh

2）显示所有操作命令


[zk: localhost:2181(CONNECTED) 1] help

3）查看当前znode中所包含的内容


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

4）查看当前节点详细数据


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

5）分别创建2个普通节点


[zk: localhost:2181(CONNECTED) 3] create /sanguo "diaochan"
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
diaochan
[zk: localhost:2181(CONNECTED) 6] get -s /sanguo
diaochan
cZxid = 0x100000003
ctime = Wed Aug 29 00:03:23 CST 2018
mZxid = 0x100000003
mtime = Wed Aug 29 00:03:23 CST 2018
pZxid = 0x100000004
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 1
[zk: localhost:2181(CONNECTED) 7]
[zk: localhost:2181(CONNECTED) 7] get -s /sanguo/shuguo
liubei
cZxid = 0x100000004
ctime = Wed Aug 29 00:04:35 CST 2018
mZxid = 0x100000004
mtime = Wed Aug 29 00:04:35 CST 2018
pZxid = 0x100000004
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 0

7）创建临时节点


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

（1）在当前客户端是能查看到的


[zk: localhost:2181(CONNECTED) 3] ls /sanguo 
[wuguo, shuguo]

（2）退出当前客户端然后再重启客户端


[zk: localhost:2181(CONNECTED) 12] quit
[hadoop@hadoop104 zookeeper-3.5.7]$ bin/zkCli.sh

（3）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

（1）先创建一个普通的根节点/sanguo/weiguo


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

（2）创建带序号的节点


[zk: localhost:2181(CONNECTED) 2] create /sanguo/weiguo "caocao"
Node already exists: /sanguo/weiguo
[zk: localhost:2181(CONNECTED) 3] create -s /sanguo/weiguo "caocao"
Created /sanguo/weiguo0000000000
[zk: localhost:2181(CONNECTED) 4] create -s /sanguo/weiguo "caocao"
Created /sanguo/weiguo0000000001
[zk: localhost:2181(CONNECTED) 5] create -s /sanguo/weiguo "caocao"
Created /sanguo/weiguo0000000002
[zk: localhost:2181(CONNECTED) 6] ls /sanguo
[shuguo, weiguo, weiguo0000000000, weiguo0000000001, weiguo0000000002, wuguo]
[zk: localhost:2181(CONNECTED) 6]

如果节点下原来没有子节点，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) 6] set /sanguo/weiguo "caopi"

10）节点的值变化监听

（1）在hadoop104主机上注册监听/sanguo节点数据变化


[zk: localhost:2181(CONNECTED) 26] [zk: localhost:2181(CONNECTED) 8] get -w /sanguo

（2）在hadoop103主机上修改/sanguo节点的数据


[zk: localhost:2181(CONNECTED) 1] set /sanguo "xishi"

（3）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）

（1）在hadoop104主机上注册监听/sanguo节点的子节点变化


[zk: localhost:2181(CONNECTED) 1] ls -w /sanguo
[aa0000000001, server101]

（2）在hadoop103主机/sanguo节点上创建子节点


[zk: localhost:2181(CONNECTED) 2] create /sanguo/jin "simayi"
Created /sanguo/jin

（3）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) 4] delete /sanguo/jin

13）递归删除节点


[zk: localhost:2181(CONNECTED) 15] deleteall /sanguo/shuguo

14）查看节点状态


[zk: localhost:2181(CONNECTED) 17] stat /sanguo
cZxid = 0x100000003
ctime = Wed Aug 29 00:03:23 CST 2018
mZxid = 0x100000011
mtime = Wed Aug 29 00:21:23 CST 2018
pZxid = 0x100000014
cversion = 9
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 1

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