These four novel components of
human thought are the ability to combine and recombine different types
of information and knowledge in order to gain new understanding; to
apply the same “rule” or solution to one problem to a different and new
situation; to create and easily understand symbolic representations of
computation and sensory input; and to detach modes of thought from raw
sensory and perceptual input.
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Uses
MapReduce is useful in a wide range of applications, including: "distributed grep, distributed sort, web link-graph reversal, term-vector per host, web access log stats, inverted index construction, document clustering, machine learning, statistical machine translation..." Most significantly, when MapReduce was finished, it was used to completely regenerate Google's index of the Internet, and replaced the old ad hoc programs that updated the index and ran the various analyses. [2]
MapReduce's stable inputs and outputs are usually stored in a distributed file system, such as Google File System. The transient data is usually stored on local disk and fetched remotely by the reduces.
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