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copied!<p>The Hadoop code is in <a href="http://svn.apache.org/repos/asf/hadoop/" rel="nofollow noreferrer">SVN</a> and in Git also. Setup the Hadoop projects in Eclipse and start exploring the code. Currently <a href="http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23/" rel="nofollow noreferrer">0.23</a>, <a href="http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.22/" rel="nofollow noreferrer">0.22</a> and <a href="http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-205/" rel="nofollow noreferrer">0.20.205</a> branches is all where the active development is happening. <a href="http://wiki.apache.org/hadoop/HowToContribute/" rel="nofollow noreferrer">HowToContribte</a> is a nice start if you want to know more about the code. Learn what is <a href="https://stackoverflow.com/questions/7053837/video-tutorial-for-hadoop/7054592#7054592">MapReduce</a>, <a href="http://shop.oreilly.com/product/0636920010388.do" rel="nofollow noreferrer">Hadoop</a> and finally setup Hadoop environment on a <a href="http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/" rel="nofollow noreferrer">Linux</a> <a href="http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/" rel="nofollow noreferrer">box</a>. Also, subscribe to the Hadoop mailing list and follow the JIRAs.</p> <p>Not sure why not <a href="http://svn.apache.org/repos/asf/hadoop/common/trunk/" rel="nofollow noreferrer">trunk</a>. All the fun stuff happens at trunk.</p>

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