ZooKeeper客户端命令

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本文详细介绍了如何使用ZooKeeper进行节点的创建、读取、更新和删除操作，包括不同类型的节点如顺序节点、临时节点和持久节点的特性及使用方法。

1、创建节点

create [-s] [-e] path data acl

-s 顺序节点； -e 临时节点；如果不指定，为持久节点；

1.1 创建顺序节点 --断开连接后节点不会消失

[zk: localhost:2183(CONNECTED) 4] ls /
[zookeeper]
[zk: localhost:2183(CONNECTED) 5] create -s /zk-test 123
Created /zk-test0000000000
[zk: localhost:2183(CONNECTED) 6] ls /
[zk-test0000000000, zookeeper]

1.2 创建临时节点 --断开连接后，节点会消失

[zk: localhost:2181(CONNECTED) 9] ls /
[zk-test0000000000, zookeeper]
[zk: localhost:2181(CONNECTED) 10] create -e /zk-temp 123
Created /zk-temp
[zk: localhost:2181(CONNECTED) 11] ls /
[zk-test0000000000, zookeeper, zk-temp]

[zk: localhost:2181(CONNECTED) 12] close
2019-12-14 16:17:06,567 [myid:] - INFO  [main:ZooKeeper@684] - Session: 0x16f033a788b0002 closed
[zk: localhost:2181(CLOSED) 13] 2019-12-14 16:17:06,567 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@519] - EventThread shut down for session: 0x16f033a788b0002

[zk: localhost:2181(CLOSED) 13] connect localhost:2181
2019-12-14 16:17:15,378 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@c2e1f26
[zk: localhost:2181(CONNECTING) 14] 2019-12-14 16:17:15,380 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2019-12-14 16:17:15,380 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@876] - Socket connection established to localhost/127.0.0.1:2181, initiating session
2019-12-14 16:17:15,384 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x16f033a788b0003, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

[zk: localhost:2181(CONNECTED) 14] ls /
[zk-test0000000000, zookeeper]

1.3 持久节点

[zk: localhost:2181(CONNECTED) 15] create /zk-test 1234
Created /zk-test
[zk: localhost:2181(CONNECTED) 16] ls /
[zk-test, zk-test0000000000, zookeeper]

2、读取节点

ls/get/ls2 path [watch]

[zk: localhost:2181(CONNECTED) 17] ls /zk-test
[]
[zk: localhost:2181(CONNECTED) 18] get /zk-test
1234
cZxid = 0x10000000d
ctime = Sat Dec 14 16:20:32 CST 2019
mZxid = 0x10000000d
mtime = Sat Dec 14 16:20:32 CST 2019
pZxid = 0x10000000d
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
[zk: localhost:2181(CONNECTED) 19] ls2 /zk-test
[]
cZxid = 0x10000000d
ctime = Sat Dec 14 16:20:32 CST 2019
mZxid = 0x10000000d
mtime = Sat Dec 14 16:20:32 CST 2019
pZxid = 0x10000000d
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0

3、更新节点

set path data [version]

[zk: localhost:2181(CONNECTED) 21] set /zk-test hellozkworld  
cZxid = 0x10000000d
ctime = Sat Dec 14 16:20:32 CST 2019
mZxid = 0x10000000e
mtime = Sat Dec 14 16:25:20 CST 2019
pZxid = 0x10000000d
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 0
[zk: localhost:2181(CONNECTED) 22] get /zk-test
hellozkworld
cZxid = 0x10000000d
ctime = Sat Dec 14 16:20:32 CST 2019
mZxid = 0x10000000e
mtime = Sat Dec 14 16:25:20 CST 2019
pZxid = 0x10000000d
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 0

4、删除节点

delete path [version]

[zk: localhost:2181(CONNECTED) 23] delete /zk-test
[zk: localhost:2181(CONNECTED) 24] ls /
[zk-test0000000000, zookeeper]
[zk: localhost:2181(CONNECTED) 25] delete /zk-test0000000000
[zk: localhost:2181(CONNECTED) 26] ls /
[zookeeper]