Building Hadoop – download and build

    Before you build Hadoop, you need to download the version that you require.
    You can explore the SVN tree here:
    http://svn.apache.org/repos/asf/hadoop/common/

    Since I was interested in the branch: “branch-20-append”, that is what I used in the following command:
    svn co http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-append/ hadoop-0.20-append

    Once it is downloaded, you need to create a build.properties file (if you want control over the naming of the archives that would be generated as a consequence of this exercise):
    cd hadoop-0.20-append/
    vi build.properties

    Insert the following:

    version=0.20-append

    Save the file and then run:
    ant mvn-install

    This will generate the required file. You can search for these files with:
    find ~/.m2 -name "hadoop-*.jar"

    References:

    http://wiki.apache.org/hadoop/HowToContribute

    http://wiki.apache.org/hadoop/HowToSetupYourDevelopmentEnvironment

    http://www.michael-noll.com/blog/2011/04/14/building-an-hadoop-0-20-x-version-for-hbase-0-90-2/

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