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What combiners are and when you should use a combiner in a mapreduce job?


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More MapReduce Interview Questions

What does a split do?

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Explain what are the basic parameters of a mapper?

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Mention what are the main configuration parameters that user need to specify to run mapreduce job?

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What are the benefits of Spark over MapReduce?

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When is it not recommended to use MapReduce paradigm for large

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How to compress mapper output in Hadoop?

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Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

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What is the problem with the small file in Hadoop?

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What are the advantages of using map side join in mapreduce?

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What is the Reducer used for?

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Why Mapreduce output written in local disk?

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Explain job scheduling through JobTracker

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