First use the Docker pull command.
Then run this command: docker run -i -t jdhan/mapreduce /bin/bash
Then type: cd MapReduce
Then to run the program type: hadoop jar Assignment3.jar TrainingRatings.txt output output1
After the program successfully runs, two new files called TopMovies.txt and TopUsers.txt should be created. Each of these files should hold the answer to the question.
To open these file type : cat TopMovies.txt