GALLERY: Hadoop Mapper

Maps are the individual tasks which transform input records into a intermediate records. The transformed intermediate records need not be of the same type as the input records. A given input pair may map to zero or many output pairs.

Mapper task is the first phase of processing that processes each input record (from RecordReader) and generates an intermediate key-value pair. Hadoop Mapper store intermediate-output on the local disk. In this Hadoop mapper tutorial, we will try to answer what is a MapReduce Mapper how to generate key-value pair in Hadoop, what is InputSplit and RecordReader in Hadoop, how mapper works in Hadoop.

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