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Reliability · medium

4. Persistence, Replication, and Failover

Balancing Redis speed with recovery requirements.

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Redis persistence can use snapshots (RDB), an append-only file (AOF), or both. RDB is compact and fast to load; AOF records write operations and can reduce data loss depending on its fsync policy. Persistence does not automatically make a deployment highly available.

Replication creates copies for reads and failover. Redis Sentinel monitors primary/replica deployments, while Redis Cluster shards data across nodes. Select the topology based on data size, availability targets, and operational complexity.

How to study this topic

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Check your understanding

  1. 1. What is a key difference between RDB and AOF persistence?

  2. 2. What does replication provide in Redis?

  3. 3. What does Redis Cluster primarily add?

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