A MySQL or MariaDB server package (MariaDB-server-10.1.47-1.el7.centos.x86_64) is installed.

Upgrading directly from MySQL 10.1 to MariaDB 10.2 may not
be safe in all cases. A manual dump and restore using mysqldump is
recommended. It is important to review the MariaDB manual's Upgrading
section for version-specific incompatibilities.

A manual upgrade is required.

- Ensure that you have a complete, working backup of your data and my.cnf
files
- Shut down the MySQL server cleanly
- Remove the existing MySQL packages. Usually this command will
list the packages you should remove:
rpm -qa | grep -i '^mysql-'

You may choose to use 'rpm --nodeps -ev <package-name>' to remove
the package which contains the mysqlclient shared library. The
library will be reinstalled by the MariaDB-shared package.
- Install the new MariaDB packages supplied by MariaDB Foundation
- Ensure that the MariaDB server is started
- Run the 'mysql_upgrade' program

This is a brief description of the upgrade process. Important details
can be found in the MariaDB manual, in the Upgrading section.
************************************************** ****************
error: %pre(MariaDB-server-10.2.41-1.el7.centos.x86_64) scriptlet failed, exit status 1
Error in PREIN scriptlet in rpm package MariaDB-server-10.2.41-1.el7.centos.x86_64
MariaDB-server-10.1.47-1.el7.centos.x86_64 was supposed to be removed but is not!
Doğrulanıyor : MariaDB-server-10.1.47-1.el7.centos.x86_64 1/2
Doğrulanıyor : MariaDB-server-10.2.41-1.el7.centos.x86_64 2/2

Başarısız Oldu:
MariaDB-server.x86_64 0:10.1.47-1.el7.centos
MariaDB-server.x86_64 0:10.2.41-1.el7.centos

en son mariadb güncellesini yum update de yapmıyor o kadar.