- Author: Abracadabra
- Full Title: System Design Paradigm: Caching
- Category: #Type/Highlight/Article
- URL: https://medium.com/p/e57a25ab2f0a
- The solution is a lease. The first cache miss will grant the app server a lease token. Only the app server having the token for a key can query DB and fill the cache. After a token is issued, all subsequent requests to the cache will be asked to retry after a period. The lease expires after a while to avoid deadlock