CAP

最新推荐文章于 2025-05-07 20:42:39 发布

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Eric Brewer在2000年的PODC会议上提出了CAP定理，阐述了在分布式系统中，数据一致性、系统可用性和网络分区容忍性这三者只能实现其中的两个。文中详细解释了CAP理论的核心思想以及最终一致性概念。

CAP理论

Eric Brewer , systems professor at the University of California, Berkeley, and at that time head of Inktomi, brought the different trade-offs together in a keynote address to the PODC (Principles of Distributed Computing) conference in 2000.¹ He presented the CAP theorem, which states that of three properties of shared-data systems—data consistency, system availability, and tolerance to network partition —only two can be achieved at any given time.

Eventually Consistency

one of the weak consistency. That is, if no more updates on the given object, accessing the object will always return the last updated value. Of couse, there is a time period between the update and all observers seeing the updated value, which called inconsistency Window.