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Hadoop - Mapper In MapReduce - GeeksforGeeks

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Hadoop - Mapper In MapReduce - GeeksforGeeks Courses Tutorials Interview Prep Big Data Analytics Tutorial Interview Questions Quizzes 6V's Unstructured Data Normalization Hadoop MapReduce Machine Learning Amazon Web Services Hadoop - Mapper In MapReduce Last Updated : 3 Oct, 2025 In Hadoop’s MapReduce framework, the Mapper is the core component of the Map Phase, responsible for processing raw input data and converting it into a structured form (key-value pairs) that Hadoop can efficiently handle. A Mapper is a user-defined Java class that takes input splits (chunks of data from HDFS), processe

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