Explain about the basic parameters of mapper and reducer function


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More MapReduce Interview Questions

What do sorting and shuffling do?

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What is a MapReduce Combiner?

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What are the various input and output types supported by mapreduce?

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What is the fundamental difference between a MapReduce InputSplit and HDFS block?

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what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

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Why is output file name in Hadoop MapReduce part-r-00000?

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Is there any point of learning mapreduce, then?

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What is a distributed cache in mapreduce framework?

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Which are the methods in the mapper interface?

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What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

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Can we submit the mapreduce job from slave node?

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What do you mean by data locality?

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