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How to create a custom key and custom value in MapReduce Job?


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More MapReduce Interview Questions

Explain how do ‘map’ and ‘reduce’ work?

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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What is the purpose of textinputformat?

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How to get the single file as the output from MapReduce Job?

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Explain what combiners are and when you should use a combiner in a mapreduce job?

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

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Clarify what is shuffling in map reduce?

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How many Reducers run for a MapReduce job in Hadoop?

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Explain job scheduling through JobTracker

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Where is the output of Mapper written in Hadoop?

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Mention Hadoop core components?

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What do you understand by the term Straggler ?

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