Grokking the System Design Interview, Volume II
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19. Read Repair

Replicas do not always agree. Read repair fixes a stale replica the moment someone reads it, instead of waiting for a separate process.

Background

In a distributed system, data is replicated across multiple nodes, so some nodes can end up with stale data. Say a node misses a write or update because it was down, or there was a network partition. How do we make sure that node gets the latest data once it is healthy again?

Definition

Repair stale data during the read itself. At read time, the system can read from multiple nodes, compare them, and find which ones are stale

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