Scaling Primitives
Caching
Lesson 2 of 5
A cache trades freshness and memory for latency; the eviction policy and the invalidation story are where designs win or lose.
What you'll learn
- Reason about cache-aside, TTL, and LRU eviction as explicit trade-offs
- Name the two hard problems: invalidation and stampede
- Pick a strategy given a read/write ratio and a staleness budget
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