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    <p>Definitely give <a href="http://www.terracotta.org/" rel="nofollow noreferrer">Terracotta</a> a try. It's free (unless you go Enterprise which has an SLA and support). It is a JVM-level cluster, so to speak, so you don't have the issues associated with sessions on multiple boxes behind disparate JK workers (assuming you're using this for a J2EE app).</p> <p>I'm just rambling, so have a look here: <a href="http://en.wikipedia.org/wiki/Terracotta_Cluster" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Terracotta_Cluster</a></p> <p><strong>UPDATE</strong> numerous bits of info on Terracotta on the web too, e.g. <a href="http://blog.terracottatech.com/2007/12/fud_of_the_week_terracotta_doe.html" rel="nofollow noreferrer">http://blog.terracottatech.com/2007/12/fud_of_the_week_terracotta_doe.html</a></p> <p><strong>UPDATE2</strong> Bit of background on my views: I work for a company with a fairly big audience. We have a enterprise MySQL running with a master and about 5 slaves (times 2 considering we have 2 channels, with 4 app servers per channel), using MySQL's JDBC Replication driver (for which we've already submitted various patches). We use Spring2.5/Hibernate3 using Spring's declarative JTA transaction management, so read-onlies go to the slaves. With the advent of numerous Ajax enhancements on a future version of our site, our DB servers' load has gone up - we create pricing summaries for thousands of products for all countries, taking into account duties/tax rules for all these countries (plus promotions and real-time auctions running all the time), then the Ajax services have the latest prices in a blink. Terracotta takes the load off the DB and app servers by making these prices available to all app servers on a JVM-layer, with all the JVMs across the boxes linked. So, server A can update the prices every few minutes, and if Ajax hits server B, the prices are available immediately. I know there are people/companies out there with similar businesses, who probably have better ideas and implementations, so I'm always open for discussion, but this is my two cents.</p> <p>I get inspiration from the guys at Facebook too, for instance this very informative article: <a href="http://www.facebook.com/note.php?note_id=23844338919" rel="nofollow noreferrer">http://www.facebook.com/note.php?note_id=23844338919</a></p> <p>They talk about <a href="http://en.wikipedia.org/wiki/Memcached" rel="nofollow noreferrer">memcached</a> which you should also definitely check out.</p>
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