Redis Clustering Guidance for designing keys and routing reads in a sharded Redis Cluster (and in standalone primary/replica replication). Covers the two failure modes that bite most new cluster users: errors on multi-key operations, and overloading primaries with read traffic. When to apply - Designing keys for a Redis Cluster deployment. - Debugging a error on , , transactions, or pipelines. - Implementing transactions / Lua scripts that touch multiple keys. - Scaling out read traffic without adding shards. 1. Hash tags for multi-key operations Redis Cluster distributes keys across 16,384 s…