Multi-Region Active-Active Database Architecture

System Design diagram · made in Skemio

System architecture diagram comparing Region East and Region West connected via Anycast Geo-DNS, showing bidirectional replication between primary databases and conflict resolver.

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What it shows

Geo-DNS routes traffic to the nearest healthy datacenter under 50ms
Two-way async replication keeps multi-region datastores synchronized
Conflict resolution relies on CRDTs or deterministic Last-Write-Wins

The takeaway

Active-active unlocks regional survivability, but requires strict conflict-resolution strategies.

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