ZooKeeper客户端命令行操作

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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

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