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Redis is full. Instead of failing gracefully, it starts silently evicting your most important cache keys — session tokens, rate limit counters, distributed locks. Your app behaves mysteriously until you realize Redis has been quietly deleting data. Here''s how to tame Redis eviction.
Redis evolved from a cache into a multi-model database: vector storage, time series, JSON, full-text search. Learn when to use Redis and modern patterns for 2026.
Master Redis patterns: cache-aside vs write-through caching, distributed locks with Lua, sliding window rate limiters, pub/sub, sorted sets for leaderboards, Redis Streams, and memory management.
Redis Streams offer persistence, consumer groups, and ordering without Kafka''s operational burden. Perfect for real-time activity feeds and notifications at scale.
The codebase is a mess. Nobody wants to touch it. The "obvious fix" requires changing 40 files. Every change breaks three things. Refactoring legacy code safely requires the strangler fig pattern, comprehensive tests before changing anything, and very small steps.