There are 2 project which are using map-reduce programming model.
Project1: TopNrecords, which gives top 10 movies based on the number of views. This project is just to get hands dirty on map-reduce programming model. Code and understanding of project can be also checked here as well - https://www.geeksforgeeks.org/how-to-find-top-n-records-using-mapreduce/?ref=leftbar-rightbar
Project2: Stock project, which give maximum closing price for each stock symbol from the given set of data. Code and Understanding of the same can be found in the respective directory. This project can give you some hands on real-world dataset.