Why Does Redis Prefer Hash Slots Over Consistent Hashing?

Redis Cluster distributes data using 16,384 hash slots calculated via CRC16, a design that offers flexible slot allocation, simpler data migration, and better performance compared to traditional consistent hashing, and this article explains the slot mechanism, node scaling, client routing, and the reasons behind the 16K slot choice.

CRC16Hash Slotscluster scaling

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Why Does Redis Prefer Hash Slots Over Consistent Hashing?

Full-Stack Internet Architecture

Sep 24, 2021 · Databases

Understanding Redis Cluster Slot Mechanism, CRC16 Hashing, and Gossip Heartbeat Protocol

This article explains the three Redis clustering modes, details how Redis Cluster uses 16384 hash slots calculated by CRC16, describes the rationale behind the slot count, and outlines the gossip‑based heartbeat communication and message format between master nodes.

BackendCRC16Cluster

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Understanding Redis Cluster Slot Mechanism, CRC16 Hashing, and Gossip Heartbeat Protocol