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From Michi Mutsuzaki <mi...@cs.stanford.edu>
Subject Re: when the zookeeper Expired ,may I have to rebuild the watch on a znode?
Date Tue, 05 Jun 2012 17:44:43 GMT
The event is called "None" (not a great name) in Java API. It's for
notifying the watches that the session state has changed.


It's up to you to decide how to handle these events. This page
provides a good insight about error handling in zookeeper.



On Tue, Jun 5, 2012 at 1:25 AM, iamct <qddxct@gmail.com> 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.

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