Analysis of information sources in references of the Wikipedia article "MapReduce" in English language version.
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As of October, Google was running about 3,000 computing jobs per day through MapReduce, representing thousands of machine-days, according to a presentation by Dean. Among other things, these batch routines analyze the latest Web pages and update Google's indexes.
"We don't really use MapReduce anymore" [Urs Hölzle, senior vice president of technical infrastructure at Google]
The MapReduce implementation in MongoDB has little to do with map reduce apparently. Because for all I read, it is single-threaded, while map-reduce is meant to be used highly parallel on a cluster. ... MongoDB MapReduce is single threaded on a single server...