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Jun 13, 2026 · Backend Development

Scaling Consumer Parallelism: From Single‑Thread to Multi‑Thread for Ten‑Million QPS

The article analyzes why single‑threaded message consumption hits processing, I/O/CPU mismatch, and fault‑tolerance limits, then walks through a step‑by‑step evolution—pull/worker split, key‑based routing, sliding‑window offset commits, backpressure, and multi‑layer parallelism—to achieve stable ten‑million‑QPS throughput.