尚硅谷大数据技术之Zookeeper (新)第4章 Zookeeper实战(开发重点)
4.2 客户端命令行操作
表5-1
命令基本语法 |
功能描述 |
help |
显示所有操作命令 |
ls path [watch] |
使用 ls 命令来查看当前znode中所包含的内容 |
ls2 path [watch] |
查看当前节点数据并能看到更新次数等数据 |
create |
普通创建 -s 含有序列 -e 临时(重启或者超时消失) |
get path [watch] |
获得节点的值 |
set |
设置节点的具体值 |
stat |
查看节点状态 |
delete |
删除节点 |
rmr |
递归删除节点 |
1.启动客户端
[atguigu@hadoop103 zookeeper-3.4.10]$ 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] 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
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
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) 6]
[zk: localhost:2181(CONNECTED) 6] get /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.创建短暂节点
[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
[atguigu@hadoop104 zookeeper-3.4.10]$ 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 -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) 6] set /sanguo/weiguo "simayi"
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 /sanguo watch
(2)在hadoop103主机上修改/sanguo节点的数据
[zk: localhost:2181(CONNECTED) 1] set /sanguo "xisi"
(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 /sanguo watch
[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] rmr /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