Installing Hadoop on Ubuntu

This is what I did to set up Hadoop on my Ubuntu machine.

1. Install the Java Development Kit.

   $ sudo apt-get install default-jdk

2. Download the latest release of Hadoop here.
3. Unpack the archive.

   $ tar -xvf hadoop-2.8.0.tar.gz

4. Move the resulting folder.

   $ sudo mv hadoop-2.8.0 /usr/local/hadoop

5. Find the location of the Java package.

   $ readlink -f /usr/bin/java | sed "s#bin/java##"
   /usr/lib/jvm/java-8-openjdk-amd64/jre/

6. Edit the Hadoop configuration file at /usr/local/hadoop/etc/hadoop/hadoop-env.sh and set JAVA_HOME.

   export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre/

7. Test.

   $ /usr/local/hadoop/bin/hadoop version

If the final command returns some information about Hadoop then the installation was successful.