intermediate~2h
Semantic Caching
Two users ask "what's your refund policy?" and "how do refunds work?" — semantically identical, lexically different. A normal cache misses both. This module doesn't.
Learning objectives
- Beginner: A semantic cache in front of a single, high-traffic FAQ endpoint, with a conservative threshold and manual monitoring of hit quality.
- Intermediate: Redis-backed semantic cache with a TTL matching how quickly the underlying answers actually change (e.g. daily for promotions, indefinite for policy text).
- Advanced: Combine with observability (Module 17) to track cache hit rate and false-positive rate over time, adjusting the threshold based on real production query patterns rather than a value chosen once at launch.
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Semantic Caching