GitHub 升級到 Rails 3 了...

GitHub 從 2.3.github 特製版升級到 Rails 3:「Upgrading GitHub to Rails 3 with Zero Downtime」,其中切換的原因之一是維護成本:

This choice has bitten us in the form of gem incompatibility, having to manually backport security patches, missing out on core framework performance and feature improvements, and being unable to easily contribute back to the open source rails project.

升級的過程工程浩大,用了四個人的全職時間去做到完美切換:

Over the last six months, we’ve had a team of 4 engineers working full time on upgrading to Rails 3.

接下來不知道是不是繼續切換到 Rails 4...

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