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Google and its MapReduce framework may rule the roost when it comes to massive-scale data processing, but there's still plenty of that goodness to go around. This article gets you started with Hadoop, the open source MapReduce implementation for processing large data sets. Authors Ravi Shankar and Govindu Narendra first demonstrate the powerful combination of map and reduce in a simple Java program, then walk you through a more complex data-processing application based on Hadoop. Finally, they show you how to install and deploy your application in both standalone mode and clustering mode.