The event is called "None" (not a great name) in Java API. It's for notifying the watches that the session state has changed.
http://zookeeper.apache.org/doc/r3.4.1/api/org/apache/zookeeper/Watcher.Event.EventType.html It's up to you to decide how to handle these events. This page provides a good insight about error handling in zookeeper. http://wiki.apache.org/hadoop/ZooKeeper/ErrorHandling --Michi On Tue, Jun 5, 2012 at 1:25 AM, iamct <[email protected]> wrote: > Thank you all > I have another question。 > > I set a watch （getData）on a znode。the getData api said ： > <p> > * If the watch is non-null and the call is successful (no exception is > * thrown), a watch will be left on the node with the given path. The > watch > * will be triggered by a successful operation that sets data on the > node, or > * deletes the node. > * <p> > > I used the method “Is there an easy way to expire a session for testing?” to > imitate the expire > （in https://cwiki.apache.org/confluence/display/ZOOKEEPER/FAQ） > > in the process,I can/t update the znode ,why the watch be triggered. > I found the WatchedEvent state is Disconnected and Expired. > > I can/t found the triggered condition in the zookeeper wiki and api. I am > confuse. > > help me! Thank you ! > > > > > > > > -- > View this message in context: > http://zookeeper-user.578899.n2.nabble.com/when-the-zookeeper-Expired-may-I-have-to-rebuild-the-watch-on-a-znode-tp7577513p7577533.html > Sent from the zookeeper-user mailing list archive at Nabble.com.
