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What is map-reduce in computer science?

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MapReduce is a simple programming model for enabling distributed computations, including data processing on very large input datasets, in a highly scalable and fault-tolerant way. While the concept of MapReduce was motivated initially by functional programming languages like LISP with its map and reduce primitives, it is also closely related to the message-passing interface (MPI) concepts of scatter and reduce for distributed-memory architectures. However, unlike in MPI programming, the details of the underlying parallelization in MapReduce are hidden from the programmer, making it easier to use.

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