https://www.compilemymind.com/tags/redis/ Recent content in Redis on Compile My Mind Hugo en Sun, 26 Jul 2026 18:30:00 +0200 https://www.compilemymind.com/posts/system-design-caching-cache-aside-expiration-invalidation/ Mon, 20 Jul 2026 12:35:30 +0300 https://www.compilemymind.com/posts/system-design-caching-cache-aside-expiration-invalidation/ <p>A cache is a copy. Every useful cache design must therefore answer a harder question than “What TTL should we use?”:</p> <blockquote class="blockquote-regular"> <p><strong>How wrong may this copy be, for how long, and what happens when the cache or origin fails?</strong></p> </blockquote> <p>Cache-aside is popular because the application controls those answers. It is also easy to implement incompletely: a fast happy path can hide stale data, stampedes, unsafe keys, and an origin that collapses the moment Redis is unavailable.</p>