ZooKeeper做独立服务器运行(下)
四、ZooKeeper Java客户端连接后的命令概述
键入help,可以看到有如下命令:
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connecthost:port
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getpath [watch]
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lspath [watch]
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setpath data [version]
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rmrpath
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delquota[-n|-b] path
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quit
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printwatcheson|off
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create[-s] [-e] path data acl
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statpath [watch]
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close
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ls2path [watch]
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history
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listquotapath
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setAclpath acl
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getAclpath
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syncpath
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redocmdno
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addauthscheme auth
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deletepath [version]
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setquota-n|-b val path
下面,我们来试用这些命令。
首先,看看列表命令,如下:
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[zk: 127.0.0.1:2181(CONNECTED) 6] ls /
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[zookeeper]
接下来,我们创建一个新的znode节点,这个znode节点相关的字符串为“my_data”,如下:
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[zk: 127.0.0.1:2181(CONNECTED) 6] create/zk_test my_data
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Created /zk_test
再次执行列表命令,如下:
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[zk: 127.0.0.1:2181(CONNECTED) 6] ls /
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[zookeeper, zk_test]
可以看到,zk_test目录已经被创建。
下面,我们使用get命令来验证此znode节点相关的数据,如下:
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[zk: 127.0.0.1:2181(CONNECTED) 7] get/zk_test
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my_data
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cZxid = 0x4
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ctime = Fri May 02 08:28:40 UTC 2014
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mZxid = 0x4
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mtime = Fri May 02 08:28:40 UTC 2014
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pZxid = 0x4
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cversion = 0
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dataVersion = 0
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aclVersion = 0
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ephemeralOwner = 0x0
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dataLength = 7
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numChildren = 0
我们还可以使用set命令修改此znode相关的数据,如下:
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[zk: 127.0.0.1:2181(CONNECTED) 8] set/zk_test junk
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cZxid = 0x4
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ctime = Fri May 02 08:28:40 UTC 2014
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mZxid = 0x5
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mtime = Fri May 02 08:34:32 UTC 2014
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pZxid = 0x4
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cversion = 0
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dataVersion = 1
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aclVersion = 0
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ephemeralOwner = 0x0
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dataLength = 4
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numChildren = 0
最后,我们可以删除此znode节点,如下:
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[zk: 127.0.0.1:2181(CONNECTED) 10] delete/zk_test
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[zk: 127.0.0.1:2181(CONNECTED) 11] ls /
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[zookeeper]
退出ZooKeeper客户端连接,执行命令:
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[zk: 127.0.0.1:2181(CONNECTED) 12] quit
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Quitting...
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2014-05-02 08:49:47,415 [myid:] - INFO [main:ZooKeeper@684] - Session:0x145bbdc9b460001 closed
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2014-05-02 08:49:47,415 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@512]- EventThread shut down
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