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


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More MapReduce Interview Questions

Compare RDBMS with Hadoop MapReduce.

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Describe what happens to a mapreduce job from submission to output?

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What is identity mapper and identity reducer?

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Write a short note on the disadvantages of mapreduce

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how Hadoop is different from other data processing tools?

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How many Mappers run for a MapReduce job?

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What comes in Hadoop 2.0 and MapReduce V2 YARN

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What do you mean by inputformat?

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

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

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mapper or reducer?

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What is SequenceFileInputFormat?

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