"genman" wrote : I figured out how to optimize it, though there are race conditions when sharing caches, but the whole thing is full of potential race conditions. :-) | You could mitigate some race conditions by using the StripedLock class in the cache loader, but this will only prevent races on the cache loader on a single instance. In a cluster, we'd need some sort of distributed locking to do this - either that, or for S3 to support transactions. :-) "genman" wrote : | By the way, to test the darn thing, you have to have an Amazon S3 account. | Hmm, a good reason then to have the tests disabled by default for automated test runs, etc. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127389#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...