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?

657

What do you mean by data locality?

720

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

653

What are ‘reduces’?

762

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

644

How do ‘map’ and ‘reduce’ work?

705

Explain the input type/format in mapreduce by default?

618

What is the difference between map and reduce?

685

What is optimal size of a file for distributed cache?

683

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Un-Answered Questions { MapReduce }

what is distributed cache in mapreduce framework?

718

What is a Speculative Execution in Hadoop MapReduce?

696

What is Output Format in MapReduce?

734

what is storage and compute nodes?

788

Explain combiners.

676

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

641

What is a RecordReader in Hadoop MapReduce?

715

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

675

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

713

Define the purpose of the partition function in mapreduce framework

710

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

748

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

757

Name job control options specified by mapreduce.

754

Is it possible to search for files using wildcards?

687

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

747

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