Grokking the System Design Interview, Volume II
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3. Quorum

Replicate data across several machines, and you gain fault tolerance, but two clients can end up reading two different answers. Quorum sets a rule for how many machines must agree before an operation counts as done.

Background

A distributed system replicates data across many servers, for fault tolerance and high availability. Once there are multiple copies, a new problem shows up: how do we know they agree? A replica can lag behind the others, so two clients reading at the same moment can see two different answers. That mismatch is the problem this pattern solves.

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