Java, as you may know, is an OOP language that has its syntactical roots in the C and C++ programming languages. It is also the language we will be using to interact with the Hadoop framework.
We will start by installing Java onto our Master Raspberry Pi. Make sure you have logged into this machine.
The latest version of the Java Development Kit (JDK) can be found on the Oracle website at the following URL:
http://www.oracle.com/technetwork/java/javase/downloads/index.html
You should note that some versions of Java (including hard-float versus soft-float) might not be compatible with your Raspberry Pi.
You can always refer to the eLinux.org RPi Java JDK installation guide for updates available at the following link:
http://elinux.org/RPi_Java_JDK_Installation
To start the Java installation, run the following command:
sudo apt-get install openjdk-7-jdk
You will now see the process running in...