Cache Stampede Prevention

Protecting origins when many requests miss or refresh the same cache key together.

Edit Concept ✏️

Cache Stampede Prevention

A cache stampede occurs when concurrent requests regenerate an absent or expired hot key at the same time. Request coalescing, locking, stale serving, and expiry jitter reduce origin load.

Yes

No

Won

Lost

Client Request

Key in Cache?

Return Cached Value

Acquire Mutex?

Fetch from Origin

Update Cache

Release Mutex

Wait / Poll / Stale