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?

572

What do you mean by data locality?

618

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

570

What are ‘reduces’?

662

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

577

How do ‘map’ and ‘reduce’ work?

602

Explain the input type/format in mapreduce by default?

548

What is the difference between map and reduce?

575

What is optimal size of a file for distributed cache?

589

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Un-Answered Questions { MapReduce }

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

635

What is the purpose of textinputformat?

672

How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?

562

Can we submit the mapreduce job from slave node?

1050

What is the inputsplit in map reduce software?

582

What is a IdentityMapper and IdentityReducer in MapReduce ?

900

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

865

What is a TaskInstance?

629

What is a "reducer" in Hadoop?

823

How do you stop a running job gracefully?

564

What is the Hadoop MapReduce API contract for a key and value Class?

1244

How to set the number of mappers for a MapReduce job?

651

What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

599

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?

663

What can be optimum value for Reducer?

900

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