I'm considering replicating XWiki across multiple Tomcat instances, and load balancing them with Apache. Has anyone ever attempted this?  I found assorted messages on this forum from ~2005 indicating that XWiki wasn't "clusterable", because there were some caches that needed synchronizing, etc.  Is this still the case?

I haven't run xwiki in a cluster so this is not first hand experience. The XWiki caches are clusterable (using OSCache + JGroups) and I'm pretty sure XWiki can be run in a cluster.

If anyone has experience with this please come forward (I know that Ludovic has and Raffaello probably too... ).

I'd love if we could document this on xwiki.org.

Thanks

-Vincent