AWS Serverless Caching Patterns: CloudFront, Redis, and Event-Driven Invalidation

Short summary

AWS caching spans three layers: CloudFront CDN for static assets, ElastiCache Redis for application-layer data, and DAX for DynamoDB acceleration. The core philosophy is avoiding work—cached content means fewer database queries and faster global responses. Event-driven invalidation via Lambda listeners keeps caches fresh in real-time without waiting for TTL expiration.

• •Multi-layer caching: CDN → application (Redis) → database (DAX)
• •Event-driven invalidation reacts to data changes in real-time rather than relying on TTL expiration
• •Lambda connection pooling at module scope prevents expensive cold-start connection overhead on every invocation

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