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A multi-region pattern reconnects WebSocket clients and restores session state

aws.amazon.com by Shubham Dhoka 9 min read Editor score 7/10

The design uses Route 53 DNS failover and DynamoDB Global Tables to recover API Gateway WebSocket applications when a regional outage severs persistent connections. It addresses both reconnection and shared session context, a useful distinction for real-time system recovery plans.

What: A multi-Region disaster-recovery pattern restores WebSocket sessions after a Regional outage by reconnecting clients and sharing application state.
How: Route 53 directs clients to a primary or secondary Region; DynamoDB Global Tables replicate state, while a canary probe and CloudWatch alarm detect failures.
Why it matters: Separating session state from persistent connections helps real-time systems recover from regional failures without losing application context.

The pattern routes WebSocket traffic and uses a canary and alarm to trigger DNS failover. Sketched from the article's own text.

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