What is Identity Mapper and Chain Mapper?
devquora
Posted On: Nov 17, 2022
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Answered by devquora
Identity Mapper: A simple mapper function in MapReduce that emits input data as key-value pairs without any transformation.
Chain Mapper: Allows multiple mapper functions to be used sequentially in a MapReduce job, enabling complex data transformations by passing output from one mapper as input to the next.
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