Time for action – downloading Hadoop

Carry out the following steps to download Hadoop:

1. Go to the Hadoop download page at http://hadoop.apache.org/common/releases.html and retrieve the latest stable version of the 1.0.x branch; at the time of this writing, it was 1.0.4.

2. You'll be asked to select a local mirror; after that you need to download the file with a name such as hadoop-1.0.4 -bin.tar.gz.

3. Copy this file to the directory where you want Hadoop to be installed (for example, /usr/local), using the following command:

   $ cp Hadoop-1.0.4.bin.tar.gz /usr/local
   

4. Decompress the file by using the following command:

   $ tar –xf hadoop-1.0.4-bin.tar.gz
   

5. Add a convenient symlink to the Hadoop installation directory.

   $ ln -s /usr/local/hadoop-1.0.4 /opt/hadoop
   

6. Now you need to add the Hadoop binary directory to your path and set the HADOOP_HOME environment variable, just as we did earlier with Java.

   $ export HADOOP_HOME=/usr/local/Hadoop
   $ export PATH=$HADOOP_HOME/bin:$PATH
   

7. Go into the conf directory within...