Cross‑Data‑Center Replication at Ten‑Million QPS: From Async to Semi‑Sync and How to Choose
The article examines why cross‑datacenter replication must evolve from simple asynchronous copying to semi‑synchronous and layered strategies at the ten‑million‑QPS scale, detailing latency, RPO, bandwidth costs, failover complexities, and practical selection guidelines for each business tier.
