Explain how big is ‘big data’?

600

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What do you know about sequencefileinputformat?

670

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Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

675

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Why the name ‘hadoop’?

668

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What do you know about nlineoutputformat?

741

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How can we change the split size if our commodity hardware has less storage space?

724

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How is hadoop different from other data processing tools?

715

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What happens in a textinputformat?

721

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Can you explain how do ‘map’ and ‘reduce’ work?

785

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Can we call vms as pseudos?

702

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What do the master class and the output class do?

712

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What does job conf class do?

714

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What do you know about keyvaluetextinputformat?

649

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Define a namenode?

713

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Explain the hadoop-core configuration?

745

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