Watcher事件类型（一）

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• 创建父节点触发：NodeCreated

[zk: localhost:2181(CONNECTED) 16] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 17] stat /imooc watch
Node does not exist: /imooc
[zk: localhost:2181(CONNECTED) 18] create /imooc
[zk: localhost:2181(CONNECTED) 19] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 20] create /imooc 123

WATCHER::

WatchedEvent state:SyncConnected type:NodeCreated path:/imooc
Created /imooc

• 修改父节点数据触发：NodeDataChanged

[zk: localhost:2181(CONNECTED) 22] get /imooc watch 
456
cZxid = 0x200000005
ctime = Tue Oct 23 11:10:28 CST 2018
mZxid = 0x200000006
mtime = Tue Oct 23 11:11:45 CST 2018
pZxid = 0x200000005
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 0
[zk: localhost:2181(CONNECTED) 23] set /imooc 789  

WATCHER::

WatchedEvent state:SyncConnected type:NodeDataChanged path:/imooc
cZxid = 0x200000005
ctime = Tue Oct 23 11:10:28 CST 2018
mZxid = 0x200000007
mtime = Tue Oct 23 11:12:14 CST 2018
pZxid = 0x200000005
cversion = 0
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 0

• 删除父节点触发：NodeDeleted

[zk: localhost:2181(CONNECTED) 24] get /imooc watch
789
cZxid = 0x200000005
ctime = Tue Oct 23 11:10:28 CST 2018
mZxid = 0x200000007
mtime = Tue Oct 23 11:12:14 CST 2018
pZxid = 0x200000005
cversion = 0
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 0
[zk: localhost:2181(CONNECTED) 25] delete /imooc

WATCHER::

WatchedEvent state:SyncConnected type:NodeDeleted path:/imooc