Scan a file using AWS EMR

I have a file which stores more than 1 million entries in the form of (a,b).My system has to scan through the file and find out 'b' for given 'a' where people suggested me to use AWS EMR since we deal with AWS resources and services. Can someone help me on this since i do not have much idea about EMR? I have gone through the basic stuffs about EMR. Does EMR solves my problem?