Besides the similarity in the use of a map and reduce function. For example does MongoDB apply a combine function?
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There would be a lot of similarities between Hadoop and MongoDB MapReduce, so the better query would be about the difference. The main difference I see is the [incremental MapReduce](http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-IncrementalMapreduce). In Hadoop, the reducers won't start processing the data until maps are done with the processing, which is not the case with MongoDB. – Praveen Sripati Oct 31 '12 at 14:12
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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/
