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In their words: This data was so useful that we’ve scheduled the MapReduce job to run monthly and we will be using this data to help us decide which Rackspace data centers to place new mail servers in as we grow. By bringing several hundred gigabytes of data together and having the tools to analyze it, the Rackspace engineers were able to gain an understanding of the data that they otherwise would never have had, and furthermore, they were able to use what they had learned to improve the service for their customers.

Analyzing the Data with Hadoop To take advantage of the parallel processing that Hadoop provides, we need to express our query as a MapReduce job. After some local, small-scale testing, we will be able to run it on a cluster of machines. Map and Reduce MapReduce works by breaking the processing into two phases: the map phase and the reduce phase. Each phase has key-value pairs as input and output, the types of which may be chosen by the programmer. The programmer also specifies two functions: the map function and the reduce function.

S legal department to work in open source. So, we set up a 200-node cluster for the researchers in early 2006 and put the WebMap conversion plans on hold while we supported and improved Hadoop for the research users. —Owen O’Malley, 2009 In January 2008, Hadoop was made its own top-level project at Apache, confirming its success and its diverse, active community. fm, Facebook, and the New York Times. 13 The processing took less than 24 hours to run using 100 machines, and the project probably wouldn’t have been embarked upon without the combination of Amazon’s pay-by-the-hour model (which allowed the NYT to access a large number of machines for a short period) and Hadoop’s easy-to-use parallel programming model.

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Arthopods: A convergent phenomenon by Schram F.


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