How does Hadoop perform input splits?

Question

This is a conceptual question involving Hadoop/HDFS. Lets say you have a file containing 1 billion lines. And for the sake of simplicity, lets consider that each line is of

Answer 1

FileInputFormat is the abstract class which defines how the input files are read and spilt up. FileInputFormat provides following functionalites: 1. select files/objects that should be used as input 2. Defines inputsplits that breaks a file into task.

As per hadoopp basic functionality, if there are n splits then there will be n mapper.