JBoss 4.2.2 Session Replication & Failover

[desmoquattro]

Hey everyone -

I'm wondering how JBoss 4.2.2 accomplishes session replication when configured in a cluster. Some app servers replicate 1:1 (e.g. each user session is replicated on only one other cluster node) while others replicate the user session on every cluster node. We've encountered lots of performance issues with our application on app servers that replicate on all nodes, and I'm looking to help a customer avoid any issues when they deploy to JBoss.

Can anyone tell me whether JBoss replicates 1:1 or on all nodes? Or is it more subtle? I perused the Wiki and did several searches, but nothing stood out at me.

[zippy1]

Hi.. not sure if you still need an answer to this but you can customise how many nodes in the cluster the session data is replicated to by using the buddy replication configuration in the META-INF/jboss-service.xml file under the jboss-web-cluster.sar folder. Hope this helps.

[erasmomarciano]

I think that you need setting in web.xml

[francis17101970]

if you're talking about HTTP session replication I can suggest you to take a look at jboss-web.xml file. The replication-trigger element determines what triggers a session replication.

<jboss-web>
 <replication-config>
 <replication-trigger>SET_AND_NON_PRIMITIVE_GET</replication-trigger>
 <replication-granularity>SESSION</replication-granularity>
 </replication-config>
</jboss-web>

Hope it helps

[sabbirali]

"francis17101970" wrote:
if you're talking about HTTP session replication I can suggest you to take a look at jboss-web.xml file. The replication-trigger element determines what triggers a session replication.

<jboss-web>
 <replication-config>
 <replication-trigger>SET_AND_NON_PRIMITIVE_GET</replication-trigger>
 <replication-granularity>SESSION</replication-granularity>
 </replication-config>
</jboss-web>

Hope it helps

can u give me location of jboss-web.xml file ???

[jaikiran]

The jboss-web.xml is located in the WEB-INF folder of the war. If your application does not have such file, then you can create one under the WEB-INF folder.