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How do ‘map’ and ‘reduce’ work?


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More MapReduce Interview Questions

Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

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what is a Task Tracker in Hadoop?

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

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What is Reducer in MapReduce?

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

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What is the key- value pair in MapReduce?

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

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

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How to write MapReduce Programs?

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Can there be no Reducer?

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What is SequenceFileInputFormat?

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