Answer / Rakesh Chauhan

NameNode is the central management node in Hadoop's HDFS file system. It maintains the namespace tree and metadata of all files, as well as the mapping between data blocks and DataNodes.

How to sort intermediate output based on values in MapReduce?

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Define MapReduce?

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Where sorting is done on mapper node or reducer node in MapReduce?

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How much space will the split occupy in Mapreduce?

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Map reduce jobs take too long. What can be done to improve the performance of the cluster?

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What do you mean by inputformat?

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What is the difference between map and reduce?

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How do Hadoop MapReduce works?

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What do you understand by compute and storage nodes?

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Explain task granularity

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What is a mapreduce algorithm?

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What is Shuffling and Sorting in a MapReduce?

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