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Amenable to extensive parallelization, Google's web sear... different queries run on different processors and,by par... overall index, also lets a single query usemultiple proc... this workload, Google's architecture features clusters o... commodity-c

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http://portal.acm.org/citation.cfm?id=776716

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Amenable to extensive parallelization, Google's web searchapplication lets different queries run on different processors and,by partitioning the overall index, also lets a single query usemultiple processors. To handle this workload, Google's architecture features clusters of more than 15,000 commodity-class pcs with fault-tolerant software. This architecture achievessuperior performance at a fraction of the cost of a system builtfrom fewer, but more expensive, high-end servers.