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


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More MapReduce Interview Questions

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

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What are the data components used by Hadoop?

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What are combiners? When should I use a combiner in my MapReduce Job?

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What platform and Java version is required to run Hadoop?

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For a job in Hadoop, is it possible to change the number of mappers to be created?

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Write a Mapreduce Program for Character Count ?

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Explain what is shuffling in mapreduce?

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What can be optimum value for Reducer?

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what are the three modes in which Hadoop can be run?

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Define the purpose of the partition function in mapreduce framework

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How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

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How can you add the arbitrary key-value pairs in your mapper?

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