How to add/delete a Node to the existing cluster?

530

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What is Mapper in Hadoop?

564

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What is Reducer in Hadoop?

555

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What are the most common InputFormats in Hadoop?

600

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Explain InputSplit in Hadoop?

468

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What is the purpose of RecordReader in hadoop?

487

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What is Combiner in Hadoop?

540

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If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

459

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Why aggregation cannot be done in Mapper?

567

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Explain map-only job?

529

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What is KeyValueTextInputFormat in Hadoop?

538

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What happen if number of reducer is set to 0 in Hadoop?

501

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What is TextInputFormat in Hadoop?

528

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What is purpose of RecordWriter in Hadoop?

514

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What are the most common OutputFormat in Hadoop?

555

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