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Explain why do we need hadoop?


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More Apache Hadoop Interview Questions

What do masters consist of?

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What is the difference between traditional RDBMS and Hadoop?

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What is commodity hardware?

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Are Namenode and job tracker on the same host?

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shouldn't DFS be able to handle large volumes of data already?

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What are the modules that constitute the Apache Hadoop 2.0 framework?

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What are the modes in which Apache Hadoop run?

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How Mapper is instantiated in a running job?

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Where do you specify the Mapper Implementation?

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What is a Secondary Namenode? Is it a substitute to the Namenode?

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What is the default block size in hdfs?

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Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?

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