MariaDB 5.2 contains features that didn't have time to go into MariaDB 5.1. For all practical purposes it's a drop in replacement for MariaDB 5.1 (and thus MySQL 5.1). MariaDB 5.2 is based on MariaDB 5.1 and thus MySQL 5.1. The new features in 5.2 are quite isolated and as most have been in use by members in the MySQL community for a long time. Current versions of MariaDB 5.2 are stable and can be