What Is Quorum (N, R, W), And Why Does R + W > N Give Strongly Consistent Reads?

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What Is Quorum (N, R, W), And Why Does R + W > N Give Strongly Consistent Reads?

Quorum (N, R, W) is a mechanism in distributed databases where data is replicated to N nodes, and each read or write operation must get responses from at least R or W of those nodes respectively; requiring R + W > N guarantees that every read will include at least one up-to-date replica, thus providing strongly consistent results.

What Is Quorum in Distributed Systems?

In distributed systems, a quorum is the minimum number of nodes that must agree or respond for an operation (like a read or write) to be considered successful.

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