Type:
Not planned session
Operate a single Drupal site at multiple locations throughout the world so that everyone can access, log in to, and create content with fast access to web and database servers geographically close to them without getting killed by impossible "multiple active master" database replication problems.
The speed of light is, unfortunately, still a constant. If your Drupal site has users in San Francisco, New York, London, Tokyo, Delhi, and Australia (and whose doesn't?), you've had no good way to give all of them fast access to your site. No matter where you put your master database server, most people have to cross an ocean to access it. Perhaps you can put read-only slave databases with local web servers in locations around the world, but then the remote users still have a long haul when they want to log in and create content---which is, after all, what your Drupal site is for.