Let us
assume that the we have an exam consisting of 10 Multiple-choice questions and
20 students appear for that exam. Every student will attempt each question. For
each question and each answer option, a key will be generated. So we have a set
of key-value pairs for all the questions and all the answer options for every student.
Based on the options that the students have selected, you have to analyze and
find out how many students have answered correctly. This isn’t an easy task.
Here Hadoop comes into picture! Hadoop helps you in solving these problems
quickly and without much effort. You may also take the case of how many
students have wrongly attempted a particular question.
