what is NameNode in Hadoop?


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More MapReduce Interview Questions

Where is Mapper output stored?

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What is the use of InputFormat in MapReduce process?

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Explain what is the function of mapreduce partitioner?

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What is RecordReader in a Map Reduce?

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Explain what is “map” and what is "reducer" in hadoop?

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What are ‘reduces’?

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What is the utility of using Writable Comparable Custom Class in Map Reduce code?

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What is identity mapper and identity reducer?

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Clarify what combiners are and when you should utilize a combiner in a map reduce job?

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For a Hadoop job, how will you write a custom partitioner?

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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What is a partitioner and how the user can control which key will go to which reducer?

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