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Eventual Consistency is a fundamental concept in distributed systems, where data changes are propagated across various nodes. It allows for greater availability and scalability since immediate consistency is not required. A common example includes NoSQL databases that offer flexible data storage.
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It allows replicas to disagree temporarily while converging when no further writes are pending.
It grew from the need for distributed stores to preserve availability and low latency during network separation instead of synchronously confirming every replica.
A write reaches an available copy first, other replicas catch up later, and readers may briefly see different versions. A conflict rule completes convergence.
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It suits globally distributed fault-tolerant applications. Briefly stale reads are acceptable; money or reservations may require stronger consistency.
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