MapReduce Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

MapReduce Interview Questions

Questions Answers Views Company eMail

What is a distributed cache in mapreduce framework?

607

What do you mean by data locality?

673

How can we assure that the values regarding a particular key goes to the same reducer?

607

What are ‘reduces’?

703

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

607

How do ‘map’ and ‘reduce’ work?

650

Explain the input type/format in mapreduce by default?

579

What is the difference between map and reduce?

627

What is optimal size of a file for distributed cache?

636

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Un-Answered Questions { MapReduce }

Why is output file name in Hadoop MapReduce part-r-00000?

629

Name job control options specified by mapreduce.

706

What is Distributed Cache in the MapReduce Framework?

625

How to write a custom partitioner for a Hadoop MapReduce job?

652

what are the basic parameters of a Mapper?

813

Can MapReduce program be written in any language other than Java?

928

How to optimize Hadoop MapReduce Job?

632

Can there be no Reducer?

840

What is heartbeat in hdfs? Explain.

681

What combiners is and when you should use a combiner in a MapReduce Job?

624

How to set mappers and reducers for MapReduce jobs?

635

what is a sequence file in Hadoop?

677

What platform and Java version is required to run Hadoop?

642

mapper or reducer?

996

Explain the difference between a MapReduce InputSplit and HDFS block?

657

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