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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is the difference between Job and Task in MapReduce?

585

Compare Pig vs Hive vs Hadoop MapReduce?

639

What is the fundamental difference between a MapReduce InputSplit and HDFS block?

589

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

608

How to get the single file as the output from MapReduce Job?

601

Why is output file name in Hadoop MapReduce part-r-00000?

582

Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

565

Explain the process of spilling in Hadoop MapReduce?

594

What Are Good Use Cases For Impala As Opposed To Hive Or MapReduce?

571

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

609

What are the benefits of Spark over MapReduce?

593

What are the disservices of utilizing Apache Spark over Hadoop MapReduce?

594

Why do we need MapReduce during Pig programming?

614

What is difference between a MapReduce InputSplit and HDFS block

645

What is the job of blend () and repartition () in Map Reduce?

603

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Un-Answered Questions { MapReduce }

What is identity mapper and reducer? In which cases can we use them?

978

How to create custom key and custom value in MapReduce Job?

572

What are the primary phases of a Reducer?

778

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

877

What is a TaskInstance?

635

What are the main components of MapReduce Job?

649

What are the various InputFormats in Hadoop?

617

How much space will the split occupy in Mapreduce?

642

what is "map" and what is "reducer" in Hadoop?

607

Different ways of debugging a job in MapReduce?

1069

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

571

What are the various input and output types supported by mapreduce?

577

What is partitioner and its usage?

641

List out Hadoop's three configuration files?

564

Why can aggregation not be done in Mapper in MapReduce?

592

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