Vernooij: Bazaar-NG: 7 years of hacking on a distributed version control system

At his blog, Jelmer Vernooij has written a detailed retrospective on the history of the Bazaar version control system, including a lot of analysis of the project's ups and downs over the years. "We just made these changes to the file format as they came along, rather than accumulating them. This meant that at one point there was a new format every couple of months. Later on, we did slow down on format changes and no new format has been introduced since 2009. Unfortunately we have been unable to shake the image that we introduce a new file format every fortnight."