Thanks.  Please clarify a bit:

1) You mention that sticky sessions are working correctly, but your #2 
indicates they aren't.  Are you finding your #1 problem even when you know 
sticky sessions are working?

2) In either case, when you see issues with requests failing over and the 
expected state not being there, do you have any feeling as to the interval 
between the requests and the load the servers are under?

You can get the "Possible Concurrency" message with this scenario:

1) Request 1 goes to server A and replicates to server B.
2) Request 2 goes to server A but replication to B hasn't completed.
3) Request 3 goes to server B.  Replication of Request 2 is not completed, so 
Request 3 sees out of date session state, which could lead to NPE or might not 
cause any noticeable problem.  When the session replicates back to server B, B 
will log the "Possible Concurrency" message.

With REPL_ASYNC, there is a higher risk of this, as Request 2 is allowed to 
complete before replication is completed.  The greater the load the system is 
under, the longer it might take the replication to complete.  The shorter the 
interval between request 2 and 3, the greater the chance the request hasn't 
completed replication.

View the original post : 
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4044496#4044496

Reply to the post : 
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4044496
_______________________________________________
jboss-user mailing list
[email protected]
https://lists.jboss.org/mailman/listinfo/jboss-user

Reply via email to