Cache Aside TTL

Use Redis cache-aside with TTL and stampede protection.

cache

Detailed Description

Cache-aside means the application checks cache first, loads from the source on miss, then stores the result with a TTL. It is simple and works well for read-heavy data.

Stampede protection prevents many concurrent misses from all hitting the database at once. TTL choice matters: too short causes misses; too long risks stale data.

Mental Model

check cache
-> miss? dedupe inflight
-> fetch DB
-> setex

When To Use

->Frequently read data changes occasionally
->DB is overloaded by repeated reads
->Many users request the same missing cache key at once

Tools: ioredis, cache-manager, lru-cache, stampede protection

cache-aside.js

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