Sequential consistency without borders: how D1 implements global read replication

D1 read replication makes read-only copies of your database available in multiple regions across Cloudflare’s network, lowering average latency by routing user requests to read replicas in nearby regions and increasing overall throughput by offloading read queries to read replicas. The new D1 Sessions API ensures sequential consistency for all queries in the session, regardless of which replica is used. This feature allows applications to serve read queries faster while maintaining strong consistency across requests, with automatically provisioned replicas in every region. The public beta is available now, and the feature will be refined and expanded based on developer feedback.

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