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Hash Slots

5 articles · Page 1 of 1
Linux Cloud-Native Ops Stack
Linux Cloud-Native Ops Stack
Jun 9, 2026 · Databases

Zero‑Downtime Redis Cluster Expansion in Production

This guide details a step‑by‑step, zero‑downtime expansion of a 3‑master‑3‑slave Redis Cluster to a 4‑master‑4‑slave setup, covering node standardization, network checks, big‑key handling, full backups, monitoring, slot migration planning, progressive migration methods, replica addition, post‑expansion validation, rollback procedures, and practical lessons learned.

ExpansionHash SlotsMonitoring
0 likes · 13 min read
Zero‑Downtime Redis Cluster Expansion in Production
dbaplus Community
dbaplus Community
Mar 4, 2025 · Databases

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.

CRC16Consistent HashingDatabase
0 likes · 9 min read
Why Does Redis Prefer Hash Slots Over Consistent Hashing?
ITPUB
ITPUB
Nov 6, 2022 · Databases

Master‑Slave, Sentinel, and Cluster: Unlocking Redis High Availability

This guide explains Redis high‑availability mechanisms, covering master‑slave replication, the Sentinel monitoring and automatic failover process, and the Redis Cluster sharding architecture, including hash slots, MOVED/ASK redirection, gossip communication, and practical considerations such as data consistency, network partitions, and slot allocation.

GossipHash SlotsHigh Availability
0 likes · 25 min read
Master‑Slave, Sentinel, and Cluster: Unlocking Redis High Availability