Scaling Mercurial at Facebook

What this post added

This post details Facebook's efforts to scale their source control system, Mercurial, to handle their massive codebase and rapid development pace. It highlights the decision to improve Mercurial over Git, the integration of Watchman for faster file status operations (over 5x faster than Git), and the development of the remotefilelog extension to make clones and pulls 10x faster by optimizing metadata and file content downloads. The post also emphasizes the open-sourcing of these extensions (hgwatchman and remotefilelog) and their positive impact on developer productivity.