Hadoop is an open source implementation of the MapReduce programming model. ... In the HDFS architecture, the master is called a NameNode and the slaves are called DataNodes.

Two Google Fellows just published a paper in the latest issue of Communications of the ACM about MapReduce, the parallel programming model used to process more than 20 petabytes of data every day ...

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Google today pledged that it will not sue any users, distributors or developers who have implemented open-source versions of its MapReduce programming model for processing large data sets, even ...