[大数据]ZooKeeper 3.5.5 基础使用

这里记录的是使用zk自带的客户端工具 zkCli.sh 进行简单的操作，以后有时间再补充。3.5.5 版本和之前的3.4版本相比，命令的使用还是有不少差别的。

最好的学习方式就是查看在线帮助文档：

https://zookeeper.apache.org/doc/r3.5.5/zookeeperStarted.html

切换到 zk 的 bin目录，使用命令 zkCli.sh 连接到本机的 zk 服务，启动成功后，会出现如下信息：

Welcome to ZooKeeper!
2021-07-31 23:34:24,869 [myid:localhost:2181] - INFO ?[main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2021-07-31 23:34:25,105 [myid:localhost:2181] - INFO ?[main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /127.0.0.1:57418, server: localhost/127.0.0.1:2181
2021-07-31 23:34:25,149 [myid:localhost:2181] - INFO ?[main-SendThread(localhost:2181):ClientCnxn$SendThread@1394] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x1000003ea520001, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
使用help命令，显示 zk支持的操作如下：

ZooKeeper -server host:port cmd args
?? ?addauth scheme auth
?? ?close?
?? ?config [-c] [-w] [-s]
?? ?connect host:port
?? ?create [-s] [-e] [-c] [-t ttl] path [data] [acl]
?? ?delete [-v version] path
?? ?deleteall path
?? ?delquota [-n|-b] path
?? ?get [-s] [-w] path
?? ?getAcl [-s] path
?? ?history?
?? ?listquota path
?? ?ls [-s] [-w] [-R] path
?? ?ls2 path [watch]
?? ?printwatches on|off
?? ?quit?
?? ?reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]
?? ?redo cmdno
?? ?removewatches path [-c|-d|-a] [-l]
?? ?rmr path
?? ?set [-s] [-v version] path data
?? ?setAcl [-s] [-v version] [-R] path acl
?? ?setquota -n|-b val path
?? ?stat [-w] path
?? ?sync path

简单的记录一下：

1、ls / 显示/根节点下的节点

我这里显示

[zk: localhost:2181(CONNECTED) 1] ls /
[persistent_sequential_node0000000001, persistent_sequential_node0000000002, test, zookeeper]

2、create 创建节点，支持创建空节点

[zk: localhost:2181(CONNECTED) 1] create /test/test
Created /test/test

3、查看节点

[zk: localhost:2181(CONNECTED) 2] ls /test
[name, snode, test]
?

4、set path value 更新path的值为value

set /test/test "test"

查看更新的节点的值
get -w /test/test
显示test

5、get -s path 查看详细信息

[zk: localhost:2181(CONNECTED) 5] get -s /test/test
test
cZxid = 0x10000001f
ctime = Sat Jul 31 23:37:23 CST 2021
mZxid = 0x100000020
mtime = Sat Jul 31 23:37:45 CST 2021
pZxid = 0x10000001f
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
?

6、删除节点

delete /persistent_sequential_node0000000001

delete /persistent_sequential_node0000000002

ls /

发现节点已删除

7、关闭当前会话

close

8、退出当前客户端连接

quit