patternjavascriptModerate
Cache Warming Strategies
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cache warmcold startpreload cacheredis rdbredis aofcache priming
Problem
After a deployment or Redis restart, the cache is empty. The first wave of requests all miss and hit the DB simultaneously, causing a cold-start spike.
Solution
Proactively populate the cache before traffic arrives. Options: (1) On deploy, run a warming script that loads the top N most-accessed keys. (2) Mirror production traffic to a staging cache before cutover. (3) Use persistent Redis snapshots (RDB/AOF) so the cache survives restarts.
Why
A warm cache is the normal operating state. Letting it fill lazily under real traffic combines a cache miss storm with production load.
Gotchas
- Warming scripts can themselves overwhelm the DB if they fetch everything at once. Rate-limit the warm-up queries.
- Warmed data may be stale by the time traffic arrives. Use short TTLs on warmed entries or invalidate them on the first real write.
- Redis persistence (AOF/RDB) slows restarts and increases disk usage. Evaluate the trade-off.
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