{excerpt}MapReduce is a framework for processing huge datasets on certain kinds of distributable problems using a large number of computers (nodes), collectively referred to as a cluster.{excerpt} Computational processing can occur on data stored either in a filesystem (unstructured) or within a database (structured).

  Also written M/R

  See Also

• http://wiki.apache.org/hadoop/HadoopMapReduce
• http://en.wikipedia.org/wiki/MapReduce