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Jun 25, 2026 · Operations

Scaling Message Queues to 10M QPS: From Downtime to Seamless Online Expansion

At the 10‑million‑QPS scale, expanding a message‑queue cluster no longer hinges on simply adding brokers; it requires coordinated online upgrades of metadata, data migration with dynamic throttling, cooperative consumer rebalance, shadow‑traffic warm‑up, and rollback snapshots, making the act of adding machines the hardest part.