Reliability Design for Multi-Region Active-Active Architecture
Overview When your business grows from “serving one city” to “serving the entire country” or even “serving globally,” single-datacenter architecture hits two hard constraints: latency from distance and single point of failure risk. Multi-region active-active architecture is the engineering solution to both problems. But active-active architecture is one of the most complex topics in SRE — it’s not simply “deploy the service in two datacenters.” It involves a series of deep engineering challenges: data consistency, traffic routing, failover, and operational complexity....