> -----Original Message----- > From: Rob Bugh [mailto:[EMAIL PROTECTED] > Sent: Tuesday, February 06, 2007 3:22 PM > To: Tomcat Users List > Subject: Re: Session Affinity and Session Replication > > > Thanks, for the information. My confusion in part stems from this comment > in the The Apache Tomcat Connector - Reference Guide, > http://tomcat.apache.org/connectors-doc/reference/workers.html > > In the comments for sticky_session: "... Set sticky_session to False when > Tomcat is using a Session Manager which can persist session data across > multiple instances of Tomcat...". Also, I've seen other comments in this > mailing list that would indicate not to use both at the same time.
If session replication is on, and synchronous (the replication completes prior to the request completing) then you do not need session affinity as all cluster members will have the up-to-date session data. If you use an asynchronous mechanism for replication, you will slightly improve your response time, but at the possible cost of the next request coming to a different cluster member which is not yet up-to-date. Combining affinity and replication gives the session a "preferred" server, with seamless failover. Not only does it work, but it works really, really well. I have been using it in a production site now for almost a year, with one Apache+mod_jk, and three Tomcats. You can shut down one Tomcat for maintenance, bring it up, and shut down the next, etc., and nobody is ever the wiser. Tim > Regards, > Rob > > -----Original Message----- > >From: Hassan Schroeder <[EMAIL PROTECTED]> > >Sent: Feb 6, 2007 2:00 PM > >To: Tomcat Users List <users@tomcat.apache.org>, Rob Bugh > <[EMAIL PROTECTED]> > >Subject: Re: Session Affinity and Session Replication > > > >On 2/6/07, Rob Bugh <[EMAIL PROTECTED]> wrote: > > > >> All the documentation I've read to date indicates not to use sticky > >> sessions and session replication together. > > > >Can you cite where you saw that? > > > >I've set up a similar config (using mod_proxy_ajp) with both sticky > >sessions and session replication and it worked fine. > > > >FWIW, > >-- > >Hassan Schroeder ------------------------ [EMAIL PROTECTED] > > > >--------------------------------------------------------------------- > >To start a new topic, e-mail: users@tomcat.apache.org > >To unsubscribe, e-mail: [EMAIL PROTECTED] > >For additional commands, e-mail: [EMAIL PROTECTED] > > > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
