MapReduce - Record

Mapreduce Pipeline


The record reader breaks the data from an input split into key/value pairs for input to the Mapper.

The key is record id.

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Mapreduce Pipeline
MapReduce - Input Split

An input split is a logical representation of the data stored in file blocks. They represents the data to be processed...
Mapreduce Pipeline
MapReduce - Map (Mapper)

The Map implementation in Hadoop in a application Mapper maps input key/value pairs to a set of intermediate key/value...

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