Explain why do we need hadoop?


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More Apache Hadoop Interview Questions

Mention what are the data components used by Hadoop?

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Which command is used for the retrieval of the status of daemons running the hadoop cluster?

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

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What is the problem with HDFS and streaming data like logs

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what should be the ideal replication factor in hadoop?

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what are Task Tracker and Job Tracker?

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what is meaning Replication factor?

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Why do we need a password-less ssh in fully distributed environment?

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Knox and Hadoop Development Tools?

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What do shuffling do?

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What is HDFS Block size? How is it different from traditional file system block size?

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Is hadoop the future?

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