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Explain the CAP theorem in distributed systems
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😃: Explain the CAP theorem in distributed systems
🤖: CAP theorem (Consistency‑Availability‑Partition tolerance)
In a distributed system three fundamental properties are considered:
| Property | What it means |
|---|---|
| Consistency (C) | Every read sees the most recent write (i.e., the system behaves as if there is a single, up‑to‑date copy of the data). |
| Availability (A) | Every request receives a response (success or failure) without waiting for network messages or other nodes. |
| Partition tolerance (P) | The system continues to operate despite arbitrary network partitions (communication failures between subsets of nodes). |
The theorem (formalized by Gilbert & Lynch, based on Eric Brewer’s “ Brewer’s conjecture”) states that in the presence of a network partition, a distributed system can guarantee at most two of the three properties. In other words, you must choose...