memcached + rdbms is really super cheap and effective. Properly architected it can be tolerant of all sorts of latency/failure/CAP issues, up to some limits of

memcached + rdbms is really super cheap and effective. Properly architected it can be tolerant of all sorts of latency/failure/CAP issues, up to some limits of course. there was a variant library that allowed you to replace memcached servers on the fly without worrying about the size of the cluster list or having to recache.