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What is Mapper in Hadoop?


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More Hadoop General Interview Questions

What happens if you don?t override the mapper methods and keep them as it is?

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Ideally what should be the block size in hadoop?

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List of the some best tools that can be useful for data-analysis?

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What jobtracker is in hadoop? What are the activities followed by hadoop?

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What do you know about yarn?

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What are the main components in Hadoop Eco-System and what are their functions ?

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In which directory hadoop is installed?

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what is next step after mapper or maptask?

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Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

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What type of data hadoop can handle ?

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Define a udf?

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If DataNode increases, then do we need to upgrade NameNode in Hadoop?

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