Hadoop and big data combo is one of the latest trends of year 2016. There is a shortage of Hadoop and big data experts. If you’re looking for a fresh start in a demanding field, it may not be a bad idea to get started with Hadoop. Hadoop however requires understanding of non-Windows operating system.
Here is a list of some free tutorials available online on Hadoop.
Yahoo! Hadoop Tutorial
This tutorial provided by Yahoo Developer Network, includes the following materials designed to teach you how to use the Hadoop distributed data processing environment:
Hadoop 0.18.0 distribution (includes full source code)
A virtual machine image running Ubuntu Linux and preconfigured with Hadoop
VMware Player software to run the virtual machine image
Download this tutorial as a single .zip file here
Master Big Data, A Free Hadoop Tutorial
Master Big Data is a free Hadoop tutorial from Guru99. This tutorial is an absolute beginner guide to Hadoop. It requires knowledge of programming Java and Linux.
http://www.guru99.com/bigdata-tutorials.html
Hadoop tutorial on coreservlets
Following is an extensive series of tutorials on developing Big-Data Applications with Hadoop. Since each section includes exercises and exercise solutions, this can also be viewed as a self-paced Hadoop training course. All the slides, source code, exercises, and exercise solutions are free for unrestricted use. Click on a section below to expand its content. The relatively few parts on IDE development and deployment use Eclipse, but of course none of the actual code is Eclipse-specific. These tutorials assume that you already know Java; they definitely move too fast for those without at least moderate prior Java experience. If you don't already know the Java language, please see the Java programming tutorial series.
Developing Big-Data Applications with Apache Hadoop
Hadoop tutorial on tutorialspoint
This brief tutorial provides a quick introduction to Big Data, MapReduce algorithm, and Hadoop Distributed File System.
This tutorial has been prepared for professionals aspiring to learn the basics of Big Data Analytics using Hadoop Framework and become a Hadoop Developer. Software Professionals, Analytics Professionals, and ETL developers are the key beneficiaries of this course.
Before you start proceeding with this tutorial, we assume that you have prior exposure to Core Java, database concepts, and any of the Linux operating system flavors.
Hadoop tutorial on tutorialspoint