Besides the similarity in the use of a map and reduce function. For example does MongoDB apply a combine function?
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Besides the similarity in the use of a map and reduce function. For example does MongoDB apply a combine function?
This thread answers your question: Hadoop Map/Reduce vs built-In Map/Reduce
You might also be interested in this post on analyzing a large number of documents using MongoDB mapReduce: http://steveeichert.com/2010/03/31/data-analysis-using-mongodb-map-reduce.html/