The HDFS is a powerful companion to Hadoop MapReduce. By setting the fs.default.nameconfiguration option to point to the NameNode (as was done above), Hadoop MapReduce jobs will automatically draw their input files from HDFS. Using the regular FileInputFormat subclasses, Hadoop will automatically draw its input data sources from file paths within HDFS, and will distribute the work over the cluster in an intelligent fashion to exploit block locality where possible. The mechanics of Hadoop MapReduce are discussed in much greater detail in Module 4.
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