Clustering & HA

Module Contents

1. Sharding & Hash Slots

Learn why Redis Cluster uses 16,384 hash slots and how keys are distributed using CRC16.

2. Topology & Gossip

Understand the P2P mesh architecture, the Cluster Bus, and how nodes gossip to detect failures.

3. Smart Clients & Redirection

Discover how clients find the right node using MOVED and ASK redirection errors.

4. Resharding & Scaling

A deep dive into online scaling, moving slots between nodes, and the MIGRATE command.

5. High Availability & Failover

How Redis Cluster automatically recovers from node failures using Replica Election and Raft-like consensus.

Review & Cheat Sheet

Test your knowledge with flashcards and a quick reference guide.

Module Chapters