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What is the use of Combiner?


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More Apache Hadoop Interview Questions

What is a secondary namenode?

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Explain the basic architecture of Hadoop?

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How Mapper is instantiated in a running job?

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What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?

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In which location Name Node stores its Metadata and why?

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Can you give us some more details about ssh communication between masters and the slaves?

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Can Hadoop be compared to NOSQL database like Cassandra?

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What is the meaning of speculative execution in Hadoop? Why is it important?

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What is keyvaluetextinputformat?

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What is a 'block' in HDFS?

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Define fault tolerance?

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