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

MapReduce Interview Questions

Questions Answers Views Company eMail

What are the advantages of using mapreduce with hadoop?

590

What do you know about nlineinputformat?

682

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

664

What is the role of recordreader in hadoop mapreduce?

733

What happens when the node running the map task fails before the map output has been sent to the reducer?

647

Define speculative execution?

714

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

660

What are the advantages of using map side join in mapreduce?

645

What is a map side join?

685

What is a combiner and where you should use it?

661

When should you use sequencefileinputformat?

660

What is the purpose of textinputformat?

703

What is reduce side join in mapreduce?

613

What do you mean by inputformat?

611

What are the various configuration parameters required to run a mapreduce job?

658

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Un-Answered Questions { MapReduce }

What is an identity mapper and identity reducer?

603

How is mapreduce related to cloud computing?

658

Explain combiners.

628

What are the steps involved in MapReduce framework?

979

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

592

What comes in Hadoop 2.0 and MapReduce V2 YARN

1002

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

626

How does inputsplit in mapreduce determines the record boundaries correctly?

646

How does MapReduce framework view its input internally?

867

How many InputSplits is made by a Hadoop Framework?

642

What do you mean by shuffling and sorting in MapReduce?

697

What is partitioning in MapReduce?

716

What is a TaskInstance?

661

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

674

What are the four essential parameters of a mapper?

652

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