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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

For a Hadoop job, how will you write a custom partitioner?

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What is the need of MapReduce?

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What are combiners? When should I use a combiner in my MapReduce Job?

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

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What is the key- value pair in MapReduce?

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Where is the output of Mapper written in Hadoop?

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What is the difference between Hadoop and RDBMS?

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What is Mapper in Hadoop MapReduce?

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

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What is the role of a MapReduce partitioner?

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How to specify more than one directory as input to the MapReduce Job?

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Explain task granularity

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