Shared session not working always

[jbaiju]

Hi all,

I am using JBoss AS 4.0 for my Application, recently we need to scale the application, so we added another JBoss AS 4.0 in cluster. It is working fine with sticky session.

But we need to share the session state so we made the changes in JBoss service .xml and the Appache for shared session, as described in the Jboss administration documentation, but the session shareing is not working always, some time it is working, suddenly the session in the clustered server gone out,

please advice me what if i am missing, i cannot figure out

thanks in advance

[manik]

Hi,

You will need to post a lot more information than that! :-)

- your cluster config
- are all your nodes on the same machine?
- have you tried the JGroups tests - http://www.jgroups.org/javagroupsnew/docs/newuser/node13.html
- anything in your error logs

[jbaiju]

Hi,
Thanks.

are all your nodes on the same machine?

No. I am running it in different machine

My cluster config file
here i am adding the lines which i changed

1. server.xml



2. jboss-service.xml

false
false
true

4. worker.properties in appache/conf

worker.list=loadbalancer,status

# Define Node1
# modify the host as your host IP or DNS name.
worker.node1.port=8009
worker.node1.host=server1
worker.node1.type=ajp13
worker.node1.lbfactor=1
worker.node1.cachesize=10

worker.node2.port=8009
worker.node2.host=server2
worker.node2.type=ajp13
worker.node2.lbfactor=1
worker.node2.cachesize=10


# Load-balancing behaviour
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=node1,node2
worker.loadbalancer.sticky_session=0
#worker.list=loadbalancer


# Status worker for managing load balancer
worker.status.type=status


These are the changes i have done, there is no error in the log, simply in the application we are verfiying for the user session if the session is not there we are redirecting to login page.

Everthing working fine with sticky session

thanks

Baiju

[jbaiju]

xml tags are missing

server.xml

Engine name="jboss.web" defaultHost="localhost" jvmRoute="node1"

jboss-service.xml

attribute name="UseJBossWebLoader" = false
attribute name="UseLocalCache = false
attribute name="UseJK" = true

[jbaiju]

Hi Manik,

Session replication is working when we change the worker.properties

worker.loadbalancer.sticky_session=0 to 1

when the first server fails, the user is redirected to the second server and the session of the user is available in the second one can you please explain me how it is working

thanks

baiju

[manik]

Hi there. This is the typical characteristic of sticky sessions, where all requests for a given session are directed to a single server until that server fails.

[shvetha]

I have a related problem regarding loadbalancing and session sharing.

I have worker.loadbalancer.sticky_session=1 in my worker.properties file on Apache. ( Let me know if I should send the complete worker.properties). Yet, the loadbalancer seems to be trying to send requests to both the servers. The first page goes to the first server and when I try submitting the page, the request goes to the second server.
And it seems like the session information has not been shared between the 2 servers yet. Because the response page has most elements missing. Only static logos and links show up. None of the real application elements are showing up.
I have set the JVMRoute='nodename' in server.xml on both servers.

An interesting thing I noticed was the when I tried to set the UseJK attribute to true in jboss-service.xml, the server would not start up and would give an error in JVMRouteFilter. So have run the server without this. But clustering works. Am using JBoss 4.0.0.

Suprisingly, failover works fine. When a server goes down, the other server picks it up instantly. I can see that the 2 servers have recognised each other and formed a cluster. Tried the jgroups Draw test recommended here too. works fine.

[jbaiju]

hi,

i think in JBoss 4.0.0 we dont need to add the attribute useJK, now we are using jBoss 4.0.2RC1 everything works fine in jboss ... but some time apache showing service not available ... if i refresh the page the page get loaded....

baiju

[brian.stansberry]

You should set the useJK flag in 4.0.2. There was a problem with the JVMRouteFilter in 4.0.0 (see issue 1037726 on Sourceforge), but that was fixed in 4.0.1.