Invalidation & Cache Consistency

TTL vs explicit invalidation vs versioned keys, the write-then-invalidate race, and cross-region coherence.

0 / 5 solved

Question Tags Difficulty Success

1. Delete Not Overwrite

cache-invalidationcache-aside +1

Medium —

2. Filled From The Follower

stale-readreplication-lag +1

Medium —

3. The Token Went Stale

cache-invalidationleases +2

Hard —

4. Born After The Miss

negative-cachingcache-invalidation +1

Hard —

5. One POST Two Origins

cache-invalidationunsafe-methods +2

Hard 33%

Learning Resources

Meta, scaling Memcache at Facebook

Up next

5 of 5 questions here are still unsolved.

Next module Stampedes, Hot Keys & Cache Failure