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01.22.2015 - Taming CAP with Policy-based Management



View VMware related news. Prof. Eric Brewer at UC Berkeley coined the CAP theorem in 1998. It has become the poster child for design trade-off discussions among architects of next generation scale-out storage and data management systems. Crudely defined, the theorem states that in the event of a network partition (P), the system can be designed to support either Consistency (C) or Availability (A). This theorem is often mistakenly generalized as a black-and-white &#rsquo;2 of 3&#rdquo; rule, and was clarified by a well-written article by Prof. Brewer in 2012. While CAP popularized the concept of trade-offs in distributed data management, C, A, and P are not the only dimensions that architects need to trade-off when they are considering design choices for building blocks of a scale-out data management system. Prof. Abadi put together a CAP variant called PACELC – it essentially highlights the latency-consistency tradeoff in the absence of partitions. Holistically, there are a large number of dimensions, including latency, throughput, scaling, locality, durability, coherence, consistency, availability, and more. I attempted to create a comprehensive list for my tutorial session at the USENIX FAST&#rsquo;12 conference, and have ever since kept continually adding to the list (a good topic for a future blog post!). The Web 2.0 companies were the early [...]]>...

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