What Mapper does?


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More Apache Hadoop Interview Questions

What is the functionality of jobtracker in hadoop?

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What do you know about nlineoutputformat?

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What is the problem with small files in Apache Hadoop?

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Explain the master class and the output class do?

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What is a spill factor with respect to the ram?

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What is the difference between hadoop and other data processing tools?

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How to keep HDFS cluster balanced?

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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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What is HDFS High Availability?

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Where is the Mapper Output stored?

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What are the different types of Znodes?

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Why do we use HDFS for applications having large data sets and not when there are lot of small files?

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