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William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
CAP is an acronym that stands for consistency, availability, and partition tolerance. The CAP theorem states that a distributed computer system can at best optimize only two of these at the same time. Your answer should communicate this to the Amazon interviewer and then discuss the tradeoffs between the components of CAP. You may want to provide examples of how you have reduced one of these components to strengthen the other two in certain situations.

William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
"The CAP theorem states that any distributed computer system can provide consistency, availability, and partition tolerance, but only two of these can be optimized at any given time. It requires tradeoffs between these three characteristics since they compete with each other. Consistency means that all the nodes on a network have equal access to all the information simultaneously. Availability addresses each node receiving responses to its requests with the same priority. Partition tolerance addresses system uptime and prevents lost transmissions. As an example, if you optimize availability and position tolerance, you sacrifice consistency. I strive to balance performance between these three characteristics based on the needs of the users and the operations they are performing."

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30 Questions & Answers • Amazon

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