Even though your organization has a Hadoop installation, they might not give access to you to learn and try some code. And for a beginner an enterprise cluster with 1000's of nodes is unnecessary. So how to try, feel and learn Hadoop for yourself..
The best and easy options available is to use Cloudera's VMWare image along with VMWare player. For beginners VMWare creates another virtual machine from your desktop, say you have a windows machine, you can install VMware player in your machine and convert into a UNIX box (pretty cool!!) vmware player is freeware from www.vmware.com (precisely : https://www.vmware.com/tryvmware/index.php)
Next regarding image from Cloudera, anyone can configure a system through VMware and save it as a file and distribute. And anyone can use the same configuration in their machine just by copying the image file in their system. We can download VMware image for Cloudera Hadoop from https://ccp.cloudera.com/display/SUPPORT/Downloads
So thats it, install VMware player and download cloudera image and just double click the *.vmx file from the downloaded directory.. a fully configured Hadoop (UNIX) machine is available for you. At the time of this writing the username and password for the image is "cloudera" and "cloudera", check with their site while downloading.
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