what is "map" and what is "reducer" in Hadoop?


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More MapReduce Interview Questions

What platform and Java version is required to run Hadoop?

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Why Mapreduce output written in local disk?

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Can we submit the mapreduce job from slave node?

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What is heartbeat in hdfs? Explain.

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

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With the help of two examples name the map and reduce function purpose

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

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How hadoop mapreduce works?

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What is Hadoop Map Reduce ?

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How many InputSplits is made by a Hadoop Framework?

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In MapReduce Data Flow, when Combiner is called?

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What is the need of key-value pair to process the data in MapReduce?

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