Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Zookeeper >> mail # user >> DISCONNECTED and SESSION_EXPIRED events


Copy link to this message
-
Re: DISCONNECTED and SESSION_EXPIRED events
You should get a CONNECTING state when you lose connectivity to zookeeper.
 I have never seen a DISCONNECTED state from the C bindings anyway.

Mark

On Wed, Apr 11, 2012 at 11:35 AM, Rohan Desai <[EMAIL PROTECTED]>wrote:

> Thanks, that answers the second part of my question. However im still
> unclear as to when the DISCONNECTED event will be received. Im currently
> assuming that Ill get it immediately after the connection is lost.
>
> On Tue, Apr 10, 2012 at 10:34 PM, Patrick Hunt <[EMAIL PROTECTED]> wrote:
>
> > On Tue, Apr 10, 2012 at 6:41 PM, Rohan Desai <[EMAIL PROTECTED]>
> > wrote:
> > > Im new to zk and had some questions about connection loss events. From
> > what
> > > I understand when a ZK handle loses connection to the ZK cluster, the
> ZK
> > > client's watch handler receives a DISCONNECTED event. If the connection
> > is
> > > lost for longer than the session timeout, the ZK client's watch handler
> > > receives a SESSION_EXPIRED event and the handle is closed. If this is
> > > correct, does the ZK client's watch handler receive the DISCONNECTED
> > event
> > > right after the client loses its connection to the cluster? When does
> the
> > > client get the SESSION_EXPIRED event? Does it get it after the client
> > > detects the session would have timed out or only after the client is
> able
> > > to re-establish a connection to the ZK cluster?
> >
> > Some good details in the faq on this:
> > https://cwiki.apache.org/confluence/display/ZOOKEEPER/FAQ
> >
> > It's not exactly as you describe - for example you can't know the
> > session is expired until you reconnect to the server.
> >
> > Also see this section in the programmer guide:
> >
> >
> http://zookeeper.apache.org/doc/current/zookeeperProgrammers.html#ch_zkSessions
> >
> > Patrick
> >
>