littlekorea writes: HipHop Virtual Machine engineer Joel Pobar has provided new insights into the software release cycle at Facebook. Among their arsenal — a tool that replays 24 hours of global activity on Facebook.com in under 45 minutes to test changes against production workloads, and another that allows a dev to switch new features into production in one country or demographic to test its uptake. It appears New Zealand is most often the first to experience new features.
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