Answer / Salman Khan

If the number of reducers is 0 in a MapReduce job, no reduction phase will be performed. This means that the output of the map phase will be directly written to the output files without any aggregation or sorting.

Explain what is “map” and what is "reducer" in hadoop?

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What is shuffling and sorting in Hadoop MapReduce?

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Explain about the basic parameters of mapper and reducer function

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What is the difference between Hadoop and RDBMS?

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how can you debug Hadoop code?

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When is it suggested to use a combiner in a MapReduce job?

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What is difference between a MapReduce InputSplit and HDFS block

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What combiners is and when you should use a combiner in a MapReduce Job?

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What is shuffling in mapreduce?

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What is the next step after Mapper or MapTask?

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What is Counter in MapReduce?

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what are the most common input formats defined in Hadoop?

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