Does Chartio support MariaDB?

Yes, Chartio supports connections to MariaDB.  However, by default MariaDB may use an out dated authentication method not supported by JDBC connections.  You will need to update the user's password to the new version before connecting with Chartio.  Please see the documentation here:

https://mariadb.com/kb/en/old_password/

http://code.openark.org/blog/mysql/upgrading-passwords-from-old_passwords-to-new-passwords