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From Bhooshan Pandit <>
Subject Re: tomcat 6.0.18 clustering.. session getting replicated partially
Date Tue, 25 Nov 2008 06:08:33 GMT
Why don't you use replicated sessions? I believe with sticky sessions the session data does
not get copied over to other servers in the LB setup, with replicated session it does.

-----Original Message-----
From: rohit aman <>
To: Tomcat Users List <>
Sent: Tue, 25 Nov 2008 6:57 am
Subject: tomcat 6.0.18 clustering.. session getting replicated partially


   I had setup a tomcat cluster with two nodes. followed the instructions
from "tomcat 6 clustering how to" document. I created a sample
application to test out my cluster.  This application has a cart where u can
add items.

now, the problem is, not all session variables are getting replicated. below
is the scenario..

1)start tomcat 1
2)access the cart add items to it ( lets say added 5 items )
3)start tomcat 2
4)add some more items ( 3 totally 8) ( this is done using tomcat 1
again because my LB is configured for sticky sessions)
5)stop tomcat 1
6)access the cart (now the request goes to tomcat 2) *I can only see
the first 5 items where as it should be 8. *So, the next three did not get

whichever session or session attribute gets created when both nodes are
running is not getting replicated for some reason.

I am monitoring both nodes with Jconsole. In Jconsole the number of session
for the application =  sessions in node 1 + sessions in node 2. So, this
says that sessions are being replicated. But, I am not sure why I am not
able to access all sessions/sessionAttributes.

Any help is very much appreciated.



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