CCloudArch/ topologydatabasePublic
[HA] Redis Sentinel (NO Sharding)
Redis Sentinel: Single master + replicas with automatic failover, client discovery, SDOWN/ODOWN consensus, split-brain prevention
ANAnonymous · maintainer
89d ago · last update
redis-sentinel-ha.js
Redis Sentinel - High Availability (No Sharding)
Overview
Redis Sentinel provides automatic high availability for a Redis master-replica setup. It does NOT do sharding. All data lives on a single master node.
Key Concepts
SDOWN vs ODOWN
- SDOWN: One sentinel's opinion that a node is unreachable
- ODOWN: Distributed consensus when quorum sentinels agree
Scenarios
- Client Discovery via Sentinel
- Normal Write with Replication
- Master Failure Detection (SDOWN to ODOWN)
- Automatic Failover (Promotion)
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