Before we start hadoop if someone wants to go through the concepts behind big data, they should have a look at the following blog post
I assume that the readers who are reading this post already know why they want to use hadoop and what are its benefits. But before we start discussing about hadoop, we need to know about clustered architectures. The following video introduces clustered architecture and discusses why it is important to know before we can understand the underlying concepts behind hadoop,
Once we know about clustered architecture, the following video gives a very simple overview and explanation of hadoop,
Now that we know about hadoop, lets go through the steps of installing it. There is a very good tutorial on installing hadoop in Ubuntu written by Michael G Noll and could be found here. I will go through the blog post and show the steps by actually doing them.