What are ‘maps’ and ‘reduces’?


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More MapReduce Interview Questions

What is heartbeat in hdfs?

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

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How hadoop mapreduce works?

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What is a map side join?

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What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

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What is the difference between Reducer and Combiner in Hadoop MapReduce?

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What does a 'MapReduce Partitioner' do?

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What is sqoop in Hadoop ?

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How is reporting controlled in hadoop?

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what is WebDAV in Hadoop?

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How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

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What is the need of key-value pair to process the data in MapReduce?

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