Interview question. A customer-account service runs in one region. It handles 8,000 requests per second, writes to a relational database, publishes account-change events, and calls an identity provider. The business wants traffic in two regions without losing committed account changes. Explain the migration, the interim guarantees, and what would make you stop it.
Reliability & Failure Recovery · Principal
How would you migrate a stateful service from one region to multiple regions?
Designing Reliable Multi-Region Systems · Part 1 of 6 · 6 min read
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