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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

How to set which framework would be used to run mapreduce program?

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What happen if the number of the reducer is 0 in MapReduce?

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How much space will the split occupy in Mapreduce?

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Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

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When Namenode is down what happens to job tracker?

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Mention what is the hadoop mapreduce apis contract for a key and value class?

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

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What is heartbeat in hdfs? Explain.

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Why do we need MapReduce during Pig programming?

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What can be optimum value for Reducer?

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In Hadoop, which file controls reporting in Hadoop?

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How to specify more than one directory as input in the Hadoop MapReduce Program?

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