Building an architecture for a single data center is straightforward. Building an architecture that operates reliably across continents—North America, Europe, and Asia-Pacific—forces engineers to confront the ultimate physical constraint: the speed of light in optical fiber ().
A packet traveling from London to Sydney takes over 150 milliseconds round-trip. If your architecture requires synchronous cross-region database locks, every single user interaction will stall. Conversely, if each region accepts writes independently, network partitions and concurrent writes generate conflicting state.
This module deconstructs global systems engineering:
- Global Ingress: How BGP Anycast and GeoDNS route millions of users to the nearest edge Point of Presence (PoP) in sub-10ms.
- Active-Passive vs. Active-Active Topologies: Why multi-region failovers fail if standby regions are not running live production traffic.
- Cross-Region Conflict Resolution: Managing concurrent updates across regions using Conflict-Free Replicated Data Types (CRDTs), Last-Write-Wins (LWW) with synchronized clocks, and deterministic tie-breaking.
- Disaster Recovery Topologies: Designing architectures to meet strict RPO (data loss window) and RTO (recovery time window) SLAs during full data center outages.