What is RecordReader in hadoop?

RecordReader reads <key, value> pairs from an InputSplit. Where key and value is-

key – the key to read data into

value – the value to read data into

RecordReader, typically, converts the byte-oriented view of the input, provided by the InputSplit, and presents a record-oriented view for the Mapper and Reducer tasks for processing. It thus assumes the responsibility of processing record boundaries and presenting the tasks with keys and values.

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