Stable Hashing for Backend Feature Rollouts Explained

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A developer article explains a method for consistent user assignment in feature rollouts. The technique hashes a durable user ID with a flag key to place users into one of 10,000 buckets, ensuring the same user is mapped to the same feature state on every request. It emphasizes recording the rollout decision alongside the operation to allow for incident reconstruction. The approach prioritizes stability and auditability over complex systems, enabling teams to answer key questions about which rule ran and what code was executed.

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