zookeeper学习(六)
下面列举一些，ZooKeeper的命令操作实例:连接server
[*]bin/zkCli.sh -server 10.1.39.43:4180
列出指定node的子node
[*] ls /
[*]
[*] ls /hello
[*][]
创建znode节点, 并指定关联数据
[*]create /hello world
创建节点/hello, 并将字符串"world"关联到该节点中.
获取znode的数据和状态信息
[*]10.1.39.43:4180(CONNECTED) 7] get /hello
[*]world
[*]cZxid = 0x10000042c
[*]ctime = Fri May 17 17:57:33 CST 2013
[*]mZxid = 0x10000042c
[*]mtime = Fri May 17 17:57:33 CST 2013
[*]pZxid = 0x10000042c
[*]cversion = 0
[*]dataVersion = 0
[*]aclVersion = 0
[*]ephemeralOwner = 0x0
[*]dataLength = 5
[*]numChildren = 0
删除znode
[*]4180(CONNECTED) 13] delete /xing/item0000000001
[*]4180(CONNECTED) 14] delete /xing
[*]Node not empty: /xing
使用delete命令可以删除指定znode. 当该znode拥有子znode时, 必须先删除其所有子znode, 否则操作将失败. rmr命令可用于代替delete命令, rmr是一个递归删除命令, 如果发生指定节点拥有子节点时, rmr命令会首先删除子节点.
使用-e参数指定创建ephemeral节点.
[*]4180(CONNECTED) 4] create -e /xing/ei world
[*]Created /xing/ei
使用-s参数指定创建sequence节点.
[*]4180(CONNECTED) 0] create -s /xing/item world
[*]Created /xing/item0000000001
[*]4180(CONNECTED) 1] create -s /xing/item world
[*]Created /xing/item0000000002
[*]4180(CONNECTED) 2] create -s /xing/item world
[*]Created /xing/item0000000003
[*]4180(CONNECTED) 3] create -s /xing/item world
[*]Created /xing/item0000000004
ls命令. ls命令的第一个参数指定znode, 第二个参数如果为true, 则说明监听该znode的子节点的增减, 以及该znode本身的删除事件.
[*]4180(CONNECTED) 21] ls /xing true
[*][]
[*]4180(CONNECTED) 22] create /xing/item item000
[*]
[*]WATCHER::
[*]
[*]WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/xing
[*]Created /xing/item
get命令. get命令的第一个参数指定znode, 第二个参数如果为true, 则说明监听该znode的更新和删除事件.
[*]4180(CONNECTED) 39] get /xing true
[*]world
[*]cZxid = 0x100000066
[*]ctime = Fri May 17 22:30:01 CST 2013
[*]mZxid = 0x100000066
[*]mtime = Fri May 17 22:30:01 CST 2013
[*]pZxid = 0x100000066
[*]cversion = 0
[*]dataVersion = 0
[*]aclVersion = 0
[*]ephemeralOwner = 0x0
[*]dataLength = 5
[*]numChildren = 0
[*]4180(CONNECTED) 40] create /xing/item item000
[*]Created /xing/item
[*]4180(CONNECTED) 41] rmr /xing
[*]
[*]WATCHER::
[*]
[*]WatchedEvent state:SyncConnected type:NodeDeleted path:/xing
stat命令. stat命令用于获取znode的状态信息. 第一个参数指定znode, 如果第二个参数为true, 则监听该node的更新和删除事件.
ps：注意上面这个例子，在/xing下建立子节点的时候，/xing/item，watch并没有触发。因为getData对于子节点创建这种事件是不会触发的，详见：
http://wjy320.iteye.com/blog/2078655
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