Explain how big is ‘big data’?

551

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What do you know about sequencefileinputformat?

638

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

648

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Why the name ‘hadoop’?

621

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What do you know about nlineoutputformat?

696

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

677

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How is hadoop different from other data processing tools?

683

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What happens in a textinputformat?

669

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

744

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Can we call vms as pseudos?

660

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What do the master class and the output class do?

675

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What does job conf class do?

676

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What do you know about keyvaluetextinputformat?

610

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Define a namenode?

666

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Explain the hadoop-core configuration?

700

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