Maxim Mironjuk
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April 12, 2026
A single Redis instance is enough for most Magento stores for a long time, but under very heavy traffic it eventually hits clear limits, both in available memory and in the maximum throughput a single process can sustain. Redis Cluster solves this by horizontally distributing data across multiple nodes, but it brings its own tuning questions that simply do not exist with a single instance. This article covers the sharding strategy and hash slot distribution, shows how to pick the right memory eviction policy, and explains how to reliably detect unevenly distributed load on individual shards.