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

MapReduce Interview Questions

Questions Answers Views Company eMail

Explain what is “map” and what is "reducer" in hadoop?

596

Explain what does the conf.setmapper class do?

571

Explain what are the basic parameters of a mapper?

754

Mention what is the next step after mapper or maptask?

593

Explain what is shuffling in mapreduce?

576

Explain what is distributed cache in mapreduce framework?

582

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

688

Explain what is the function of mapreduce partitioner?

600

What is map/reduce job in hadoop?

607

What is a mapreduce algorithm?

580

What is mapreduce algorithm?

552

When the reducers are are started in a mapreduce job?

553

Where the mapper's intermediate data will be stored?

590

Which are the methods in the mapper interface?

581

What is an identity mapper and identity reducer?

567

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Un-Answered Questions { MapReduce }

Why Hadoop MapReduce?

626

what does the conf.setMapper Class do ?

771

What is the purpose of textinputformat?

672

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

643

Name job control options specified by mapreduce.

664

What is the function of mapreduce partitioner?

588

How to configure the number of the Combiner in MapReduce?

591

How many Reducers run for a MapReduce job in Hadoop?

555

What is the use of InputFormat in MapReduce process?

614

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1172

Compare Pig vs Hive vs Hadoop MapReduce?

626

Explain Working of MapReduce?

920

Explain the Reducer's reduce phase?

1011

What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

794

What is the next step after Mapper or MapTask?

594

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