Since you're reading this, you probably know that Sun is switching to the Bazaar version control system for all development work on the MySQL server. Unlike the version control system that we've been using previously, Bazaar is an open source project and freely available to anyone. This means that it is now much easier to follow ongoing development, or even to participate in it! On the downside, just like our previous tool, Bazaar is not quite as straight-forward as traditional version control systems such as CVS or subversion. The aim of this article is to give an overview and a general idea of how to set up Bazaar, how to access the MySQL server source code repositories, and the basic commands for working with the source code.

The MySQL project switched from Bitkeeper to another revision control system, Bazaar, in June 2008. My colleague Daniel Fischer wrote an excellent article describing how to get MySQL's code by using Bazaar, and how to compile a MySQL server binary from this. Here I am going to build on this knowledge and take it further, to show you how to modify MySQL's code for your needs, and share your modifications.

When I joined MySQL back in June of 2005, one of the first “MySQL Truths” I learned and repeated often when discussing MySQL with others was “release early, release often.” If you’ve been using MySQL for any length of time, you know what that statement means – it meant that MySQL was: (1) dedicated to getting new features and enhancements into the hands of its community so the software’s quality could be validated; (2) eager to take early feedback on those features so the input could rapidly be incorporated back into the product allowing everyone to benefit; (3) committed to very frequent releases of the software so helpful new features and/or external contributions that were ready for action could quickly be put into play and not sit idle on the shelf. And if you’ve been around Open Source for a while now, you know this is the spirit in which most providers of Open Source software operate.

Tomas Ulin, MySQL Server Director, explains the new MySQL release model which has just recently been announced.