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InputFormat defines the splits of input file it is the first component of Map-Reduce,
since Map task depends on the data , InputFormat defines the size of the Map task and also the defines the RecordReaderTextInputFormat is the default InputFormat, its for the plain text files, where each line is considered as records.
key- Byte offset
value – Rest of the line -
Input Format defines how input file is going to be read and split up.So TextInputFormat is the default InputFormat in which each line is treated as a Separate record.key (a Long Writable) is the byte offset within the file of the beginning of the line and value is the contents of the line( excluding any line terminators).
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