Interview question. A consumer API serves 60,000 requests per second across three regions. One region becomes unavailable. A global router moves its users to the other two regions, but both begin returning 503s. Design the regional capacity, traffic-shift policy, and dependencies so failover improves availability instead of extending the outage.
Reliability & Failure Recovery · Staff
How would you fail over regional traffic without overwhelming the healthy region?
Designing Reliable Multi-Region Systems · Part 5 of 6 · 6 min read
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