If you are interested in countries indicators, the best source I found was worldbank.org. The data they offer can be exported as CSV which makes it very easy to work with in Hadoop. If you are using .NET, I wrote a blogpost http://ryanlovessoftware.blogspot.ro/2014/02/creating-hadoop-framework-for-analysing.html where you can see how the data looks, and if you download the code from gidhub https://github.com/ryan-popa/Hadoop-Analysis, you already have the string parsing methods.
