If you upgrade from MaxScale 1.0.4 to 1.0.5, and try to remove the 1.0.5 RPM, you get an error.

[root@max1 skysql]# rpm -i http://downloads.mariadb.com/software/MaxScale/maxscale/RPM/rhel6/maxscale-1.0.4-stable.rpm
[root@max1 skysql]# yum update maxscale
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package maxscale.x86_64 0:1.0.4-1 will be updated
---> Package maxscale.x86_64 0:1.0.5-1 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================================================
Package Arch Version Repository Size
============================================================================================================================================================================================================
Updating:
maxscale x86_64 1.0.5-1 maxscale 5.0 M

Transaction Summary
============================================================================================================================================================================================================
Upgrade 1 Package(s)

Total download size: 5.0 M
Is this ok [y/N]: y
Downloading Packages:
maxscale-1.0.5-stable.rpm | 5.0 MB 00:06
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Updating : maxscale-1.0.5-1.x86_64 1/2
Cleanup : maxscale-1.0.4-1.x86_64 2/2
Verifying : maxscale-1.0.5-1.x86_64 1/2
Verifying : maxscale-1.0.4-1.x86_64 2/2

Updated:
maxscale.x86_64 0:1.0.5-1

Complete!
[root@max1 skysql]# rpm -e maxscale
rm: cannot remove `/etc/init.d/maxscale': No such file or directory
rm: cannot remove `/etc/ld.so.conf.d/maxscale.conf': No such file or directory
warning: %postun(maxscale-1.0.5-1.x86_64) scriptlet failed, exit status 1