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Hadoop > Learn Hadoop > What is the purpose of RecordReader in Hadoop?
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What is the purpose of RecordReader in Hadoop?

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RecordReader converts input splits into key-value pairs for the Mapper.
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to convert data from an InputSplit into key-value pairs that the Mapper can process.
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RecordReader in Hadoop: Converts input splits into key-value pairs. Feeds these pairs to the Mapper. Handles how data is parsed/read from files (e.g., line-by-line). Purpose: Acts as a bridge between raw data and the Mapper.
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to convert data from an InputSplit into key-value pairs that the Mapper can process.
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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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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. read less
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The purpose of RecordReader in Hadoop is to convert the input splits into key-value pairs for processing by the Mapper. Key Role: Reads data from HDFS block (split) Parses it into logical records (e.g., line-by-line) Emits key-value pairs to the mapper Example: In TextInputFormat, it outputs: Key...
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The purpose of RecordReader in Hadoop is to convert the input splits into key-value pairs for processing by the Mapper. Key Role: Reads data from HDFS block (split) Parses it into logical records (e.g., line-by-line) Emits key-value pairs to the mapper Example: In TextInputFormat, it outputs: Key = byte offset Value = line of text So, RecordReader bridges raw data and mapper input. read less
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