Comments - MariaDB versus MySQL - Compatibility
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If you are replacing MySQL 5.1 with MariaDB 5.2 or MariaDB 5.3 (e.g. MySQL 5.1.61, MariaDB 5.2.10 or 5.3.4 which are latest at the moment), it is wise to run mysql_upgrade even although MariaDB server includes the same MySQL version. MariaDB has a slightly different structure of mysql.event table, which causes event scheduler to be disabled on server startup, with the corresponding message in the error log file. Running mysql_upgrade and restarting the server afterwards fixes that.