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?

609

Explain what does the conf.setmapper class do?

580

Explain what are the basic parameters of a mapper?

763

Mention what is the next step after mapper or maptask?

600

Explain what is shuffling in mapreduce?

590

Explain what is distributed cache in mapreduce framework?

591

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

699

Explain what is the function of mapreduce partitioner?

610

What is map/reduce job in hadoop?

618

What is a mapreduce algorithm?

595

What is mapreduce algorithm?

565

When the reducers are are started in a mapreduce job?

563

Where the mapper's intermediate data will be stored?

599

Which are the methods in the mapper interface?

595

What is an identity mapper and identity reducer?

574

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Un-Answered Questions { MapReduce }

What is the Job interface in MapReduce framework?

876

What are the identity mapper and reducer in MapReduce?

743

What do sorting and shuffling do?

652

What do you understand by the term Straggler ?

645

How to set mappers and reducers for Hadoop jobs?

578

What are the steps involved in MapReduce framework?

939

What is KeyValueTextInputFormat in Hadoop MapReduce?

780

What are ‘reduces’?

675

What is a distributed cache in mapreduce framework?

581

what job does the conf class do?

752

How to optimize Hadoop MapReduce Job?

608

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

572

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

684

What are mapreduce new and old apis while writing map reduce program?. Explain how it works

593

What is the relationship between Job and Task in Hadoop?

625

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