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Jul 7, 2026 · Backend Development

Managing API Versions at Ten‑Million QPS: From Single Version to Coexisting Multi‑Versions

A tiny field‑addition and rename in an order service caused a cascade failure in a three‑year‑old reconciliation job, illustrating how any incompatible change in a system handling tens of millions of QPS can trigger an avalanche, and the article explains why version management, compatible design, multi‑version coexistence, and disciplined governance are essential to keep such large‑scale services reliable.