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What combiners are and when you should utilize a combiner in a map reduce job?


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More MapReduce Interview Questions

Mention Hadoop core components?

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

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How many Mappers run for a MapReduce job in Hadoop?

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Explain task granularity

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How to optimize MapReduce Job?

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Define the purpose of the partition function in mapreduce framework

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Mention when to use Map reduce mode?

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What are the data components used by Hadoop?

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What does conf.setmapper class do?

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Why Mapreduce output written in local disk?

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What is Text Input Format?

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Explain JobConf in MapReduce.

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