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What is Reducer in MapReduce?


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More MapReduce Interview Questions

What is the difference between Hadoop and RDBMS?

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In Hadoop, which file controls reporting in Hadoop?

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What is Text Input Format?

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What is difference between an input split and hdfs block?

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How to specify more than one directory as input to the MapReduce Job?

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what is a sequence file in Hadoop?

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What is Output Format in MapReduce?

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

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What is shuffling and sorting in mapreduce?

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What is the utility of using Writable Comparable Custom Class in Map Reduce code?

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Can you tell us how many daemon processes run on a hadoop system?

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Where is the output of Mapper written in Hadoop?

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