[jboss-jira] [JBoss JIRA] Closed: (EJBTHREE-1375) Clustered SFSB creation not properly load balanced

[Brian Stansberry (JIRA)]

     [ http://jira.jboss.com/jira/browse/EJBTHREE-1375?page=all ]

Brian Stansberry closed EJBTHREE-1375.
--------------------------------------

    Resolution: Done

> Clustered SFSB creation not properly load balanced
> --------------------------------------------------
>
>                 Key: EJBTHREE-1375
>                 URL: http://jira.jboss.com/jira/browse/EJBTHREE-1375
>             Project: EJB 3.0
>          Issue Type: Bug
>          Components: proxy, Clustering
>    Affects Versions: AS 5.0.0.Beta4
>            Reporter: Brian Stansberry
>         Assigned To: Brian Stansberry
>            Priority: Critical
>             Fix For: AS 5.0.0.CR1
>
>
> The logic for load balancing SFSBs depends on the fact that a bean context is not created until the first invocation on the proxy.  The proxy uses FirstAvailable (by default) and that first invocation picks a random target.  Until recent changes, that first invocation would create the server-side bean context.  Thereafter FA ensures all subsequent invocations go to that same server, where the bean context resides.
> Following recent changes in EJB3, now the SFSB bean context is created early, at the same time as the proxy.  This breaks the existing setup in 2 ways:
> 1) The load balance policy in the proxy knows nothing about where it came from. For the first invocation it will pick a random target, which is not likely to be where the bean resides, forcing a cross-cluster failover of the context when the request arrives server side.
> 2) The invocation from the client-side proxy factory proxy to the server-side proxy factory is not load balanced.  The invocation will go to whatever server the client did the JNDI lookup on.  If those JNDI lookups aren't load balanced, the session creation won't be either.
> To solve these issues:
> 1) The proxy to the proxy factory needs to be load balanced. 
> 2) Need to find a way to communicate the initial target to the load balance policy.  Probably by default SFSBs use a special load balance policy that can examine the AOP invocation for metadata.  Tricky part is getting the proper target into the proxy so it can add it to the metadata.  The proxy factory doesn't really know how to identify what "target" is associated with the current node; a "target" is an opaque object.

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