Why have supercomputers been superceded by distributed clusters?

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Supercomputers are now thousands, or tens or hundreds of thousands of those processors lashed together with as fast an interconnect as we know how to build, and your High-Performance Computing applications had better be coded to be as parallel as they can be to take advantage of all that Parallel Com...
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Is there a list of the world's largest Hadoop clusters on the web?
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what should I know before learning hadoop?
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