[Linux-cluster] JBoss Clustering Compatibility

[Riaan van Niekerk]

Lon Hohberger wrote:
> On Mon, 2006-08-21 at 14:13 -0400, Sutterfield, Geary L. wrote:
>> Hello all,
>>  
>> Does anyone have any information or experience about using GFS and the
>> Cluster Suite and JBoss Clustering on the same cluster? I've been
>> looking for a couple of days, but I can't seem to find any information
>> on that configuration. Our goal is to create a J2EE cluster with a
>> shared, global filesystem. GFS seemed like a logical choice. 
>>  
>> I'm speculating that if Cluster Suite was only used for GFS, and not
>> for any other services, then it might work okay with JBoss Clustering.
>> Cluster Suite would handle the GFS clustering, and JBoss Clustering the
>> J2EE app server clustering. But I also wonder about conflicts or
>> incompatibilities. And I especially wonder how fencing would impact
>> JBoss. Has anyone tried this configuration, or heard of anyone who has?
> 
> I have not tried it, but here are some of the 'gotchas':
> 
> (a) Disagreements in the JBoss cluster view vs. the GFS cluster view.
> GFS cluster view should always win in the end, because it has fencing.
> So, the GFS/RHCS cluster should be configured to converge on membership
> changes before JBoss (whether that means increase deadnode_timeout, or
> tweaking JBoss is up to you).
> 
> (b) Cluster quorum.  I don't know much about JBoss clustering (yet), but
> remember that cluster suite / GFS need a majority of votes (normally,
> there's a 1:1 correlation between nodes and votes) available in order to
> form a quorum.  Without a quorum, access to GFS will be halted.
> 
> (c) Fencing.  You will probably need to use power-based fencing, because
> storage/SAN level fencing will not drop a node out of the JBoss cluster
> by itself.  Since I don't currently know much about JBoss clustering
> generally, I also don't know the specific implications of trying to run
> JBoss on a given node after the GFS volumes have been cut off from that
> node.  I *assume* that JBoss would take that node out of the JBoss
> cluster.
> 
> 
>> If there any problems, I suppose they will be worked out eventually,
>> since Red Hat has acquired JBoss. But we don't want to waste a lot of
>> time going down a path with known problems. Any thoughts or feedback
>> would be appreciated.
> 
> -- Lon

What is the process for initiating/requesting a white paper to be 
written about a particular topic? JBoss on Red Hat Clustering with GFS 
might make for a very good topic for a white paper

Riaan

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