Tài liệu High Availability MySQL Cookbook phần 7

It is an extremely good idea to ensure that you are running the latest version of MySQL in
your cluster if you are experiencing problems. People are naturally reluctant to help users
fix problems when running versions of MySQL more than a couple of minor releases behind
current, as this is, in effect, known buggy software and many bugs are fixed in each release. If
upgrading is impossible, then be sure to check the changelists of later versions to ensure that
whatever issue you have experienced has not been reported and fixed.