Data Consistency Across Caches
Address challenges of maintaining data consistency and freshness across multiple caching layers in complex systems.
Why Consistency Matters
When you have multiple layers of caching, like a browser cache, a CDN, an edge cache, and an application cache (e.g., Redis), data consistency becomes a big challenge.
Users expect to see the most up-to-date information. If your product price changes in the database, but an old price is served from a CDN, that's a problem!
The Multi-Layer Challenge
Imagine your data journey:
- Origin Database: The source of truth.
- Application Cache (Redis): Stores frequently accessed data for your app.
- Edge Cache: Caches dynamic content closer to users.
- CDN: Caches static assets globally.
- Browser Cache: Your user's local cache.
Each layer can hold a copy of the data. How do you ensure they all reflect changes from the origin?
All lessons in this course
- Combining Redis and CDN
- Multi-Layer Caching Strategy
- Data Consistency Across Caches
- Cache Key Design & Request Coalescing