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

MapReduce Interview Questions

Questions Answers Views Company eMail

What does a 'MapReduce Partitioner' do?

637

What is the difference between Reducer and Combiner in Hadoop MapReduce?

624

What is Data Locality in Hadoop?

610

What is KeyValueTextInputFormat in Hadoop MapReduce?

764

What is Mapper in Hadoop MapReduce?

690

How to set mappers and reducers for MapReduce jobs?

600

How to sort intermediate output based on values in MapReduce?

624

Can we set the number of reducers to zero in MapReduce?

666

Where sorting is done on mapper node or reducer node in MapReduce?

625

Which Sorting algorithm is used in Hadoop MapReduce?

561

What is the need of MapReduce?

582

How to configure the number of the Combiner in MapReduce?

591

How to change a number of mappers running on a slave in MapReduce?

753

Is it mandatory to set input and output type/format in MapReduce?

674

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

651

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Un-Answered Questions { MapReduce }

How to optimize MapReduce Job?

617

For a job in Hadoop, is it possible to change the number of mappers to be created?

734

Explain what is distributed cache in mapreduce framework?

582

Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

563

What do you understand by mapreduce?

594

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

607

Explain the process of spilling in Hadoop MapReduce?

584

what are the main configuration parameters that user need to specify to run Mapreduce Job ?

577

What is map/reduce job in hadoop?

607

How many InputSplits is made by a Hadoop Framework?

580

What is the Reducer used for?

887

How data is spilt in Hadoop?

617

How do Hadoop MapReduce works?

672

In MapReduce how to change the name of the output file from part-r-00000?

602

In Hadoop what is InputSplit?

589

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