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?

683

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

666

What is the role of recordreader in hadoop mapreduce?

734

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

649

Define speculative execution?

715

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

662

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

646

What is a map side join?

685

What is a combiner and where you should use it?

663

When should you use sequencefileinputformat?

662

What is the purpose of textinputformat?

704

What is reduce side join in mapreduce?

615

What do you mean by inputformat?

612

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

660

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Un-Answered Questions { MapReduce }

What do you mean by inputformat?

612

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

786

What is the InputSplit in map reduce ?

1026

What platform and Java version is required to run Hadoop?

642

What is the difference between map and reduce?

627

Explain JobConf in MapReduce.

810

Write a Mapreduce Program for Character Count ?

1049

How to write MapReduce Programs?

714

what is distributed cache in mapreduce framework?

673

In Hadoop what is InputSplit?

630

What is shuffling in mapreduce?

607

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

687

What are the fundamental configurations parameters specified in map reduce?

635

Define the Use of MapReduce?

666

When is it not recommended to use MapReduce paradigm for large scale data processing?

655

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