Change Notes item #915161, was opened at 2004-03-12 19:27
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: Clustering
Group: v3.2
Status: Open
Priority: 5
Submitted By: Sacha Labourey (slaboure)
Assigned to: Nobody/Anonymous (nobody)
Summary: Load-balance policy can now be aware of their birth node

Initial Comment:
General:
LB policies can now be aware of the node on which they 
have been created by extending the new 
LoadBalancePolicyEx interface. The FirstAvailable policy 
has been modified to benefit from that feature.

Details:
In the past, proxies that had to pick-up a first target 
couldn't simply ask on which node they had been 
created and use that node. This is now possible. 

This is specifically interesting for SFSB: the default 
remote LB is now not only using the "FirstAvailable" (i.e. 
sticky) policy but will also start using the node on which 
the session has been originally created to perform 
remote calls (i.e. the node on which the home.create 
(...) has been performed.)

This is interesting for (possibly clustered) webapps 
making calls to a remote and distinct cluster of SFSB 
(http session containing a SFSB for example) as the 
resulting load-balancing of SFSB may not be very 
efficient in some cases and cause un-necessary failover 
just after the session has been created.

Migration:
The new behaviour should only be better (better 
dispatching of session and less unnecessary initial 
failovers). However, if you want to disable that new 
behaviour, set 
the "jboss.cluster.proxy.dont_remember_home" Java 
system property to "true" on the **client side** JVM.

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