Geo Replication & Multi-Region

Why geo replication

Users are everywhere. Multi-region deployments reduce latency and improve availability, but increase consistency challenges.

Latency tradeoffs

A global read can be fast (local) or consistent (quorum). You choose based on requirements and error budgets.

Multi-region quorums

You can satisfy a quorum by combining replicas across regions. The slowest region you contact often sets the end-to-end latency.

Conflict resolution at distance

Long RTTs increase the chance of concurrent writes. You often rely on reconciliation strategies (vector clocks, LWW) after the fact.

What you will build

• Latency-aware quorum routing