This week in caching: scaling the Redis cache tier

This week in caching: scaling the Redis cache tier
Three for when one Redis box stops being enough.
— Sentinel for HA, Cluster for shards — Sentinel gives failover on a single dataset; Cluster splits keys across nodes. People reach for Cluster when they needed Sentinel.
— client-side caching (RESP3 tracking) — Redis 6's invalidation push lets clients cache locally and get notified on change; cuts round-trips for hot read keys hard.
— separate cache and session instances — mixing volatile cache (LRU eviction) with sessions (must persist) on one instance is a data-loss waiting room.
Bookmark: the RESP3 client-side-caching docs — assisted invalidation is the feature most teams don't know they have.