How do ‘map’ and ‘reduce’ work?


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More MapReduce Interview Questions

When Namenode is down what happens to job tracker?

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Why Hadoop MapReduce?

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How to change a number of mappers running on a slave in MapReduce?

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how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

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How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?

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Write a Mapreduce Program for Character Count ?

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What do you mean by inputformat?

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Can we rename the output file?

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what job does the conf class do?

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It can be possible that a Job has 0 reducers?

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What is the InputSplit in map reduce ?

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

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