"srnm" wrote : | Am I correct in thinking that the FQN is really the "key" and that the fanout of actual keys underneath should be kept very small? | Correct. This will help you achieve maximum concurrency in the cache. "srnm" wrote : | Do the jdbc loaders update a row/single key in a node at a time? If so, how do they support the semantics of the cache? | By using a separate shared lock on the Fqn. See, for example, line 181 in JDBCCacheLoader "srnm" wrote : | Are there any hints recorded as to how to design a cache structure for optimal performance? It depends. Where are your bottlenecks? Is it in concurrency, replication or cache loading? :-) Either way though, use the tree structure fully, don't put too much in each node. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4064512#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...