ArchitectArchitect (10+ yrs)RedisKafkaSystem DesignAmazonWalmartShopify
CAP theorem in practice
How do you apply CAP when designing a checkout service vs a product catalog?
Answers use simple, clear English.
Quick interview answer
Checkout usually prefers consistency (CP or strong consistency within a region) to avoid double-charge/oversell, using transactions/sagas. Catalog/search can prefer availability and eventual consistency (AP) with caches and async index updates. Real systems choose trade-offs per use case, not globally.
Detailed answer
Checkout usually prefers consistency (CP or strong consistency within a region) to avoid double-charge/oversell, using transactions/sagas. Catalog/search can prefer availability and eventual consistency (AP) with caches and async index updates. Real systems choose trade-offs per use case, not globally.
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