The Engineer's Journal
Knowledge Entry

CAP Theorem

A principle describing trade-offs between consistency and availability during network partitions.

The Engineer's Journal·Aug 24, 2026·1 min read
softwareinfrastructure
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CAP is often oversimplified into a slogan. Its real value is as a forcing function: what behavior do we prefer when communication is unreliable?

References

  1. Brewer's conjecture and the feasibility of consistent, available, partition-tolerant web services · ACM SIGACT News

Connected Knowledge

Concept

Distributed Systems

A distributed system is a system made of independent components that communicate over a network to behave like one useful whole.

Concept

Consensus

Consensus is agreement under uncertainty: multiple participants decide on one value even when messages and machines may fail.

Mental Model

Trade-offs

A way to reason about engineering choices where improving one property changes cost, complexity, risk, or behavior elsewhere.

SoftwareInfrastructureProduct engineeringLeadershipDecision-making