Scaling Beyond a Single Cache Shard: One Game Engine's Architecture Overhaul

This article reveals why write-heavy systems require multi-tier cache architectures, not just bigger Redis clusters. By separating L1 local caches from L2 distributed caches and adding write-ahead logging to Kafka, the team eliminated memory evictions and recovered cache hit rates to 94%—a critical pattern for real-time gaming backends and systems that can't afford cache misses.