Interview question. Region A was the original writer for a customer-account service. After an outage, region B was promoted and accepted writes for six hours. A is now reachable, but its database is stale and an old leader process is still running. Plan a safe return to A, including missing writes, ownership, retries, and a recovery abort condition.
Reliability & Failure Recovery · Principal
How would you safely fail back after six hours of writes in the recovery region?
Designing Reliable Multi-Region Systems · Part 6 of 6 · 6 min read
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