Content Delivery Network

HLDAdvanced50 minCaching & delivery Traffic & quotas

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Choose the policy you would defend in a design review. Choices save as you go.

1.What makes a shared response safe to cache?

Its URL has a short nameExplicit cacheability and a key including all representation/access dimensionsIt returned any 200 status

2.How should a hot expired object be fetched?

Every edge request hits origin immediatelyRetry with no concurrency limitCoalesce misses and bound origin work through a shield

3.What does an asynchronous purge promise?

Propagation with an explicit completion/freshness contractInstant removal everywhere without acknowledgementRevocation of bytes already downloaded by a client

Trade-offs, failure cases and tests

Explain a rejected alternative, a failure mode and how you would test the design. At least 80 characters for the completeness check.

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Review my design