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what is NameNode in Hadoop?


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More MapReduce Interview Questions

What is the Reducer used for?

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What is difference between a MapReduce InputSplit and HDFS block

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How does inputsplit in mapreduce determines the record boundaries correctly?

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How do ‘map’ and ‘reduce’ work?

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What do you mean by data locality?

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Detail description of the Reducer phases?

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Does Partitioner run in its own JVM or shares with another process?

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Explain how do ‘map’ and ‘reduce’ work?

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Explain task granularity

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what are the main configuration parameters that user need to specify to run Mapreduce Job ?

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Explain the Reducer's reduce phase?

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What is the role of recordreader in hadoop mapreduce?

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