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Oct 6, 2026 · Backend Development

From Manual DNS to 90-Second Auto-Failover: Traffic Recovery Evolution at 10M QPS

This article traces the evolution of traffic recovery from manual DNS changes taking 47 minutes to fully automated 90-second failover, detailing the three-layer scheduling architecture, multi-source voting, capacity verification, batched switching, and protection mechanisms that make automatic failover safe at 10M QPS scale.