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

MapReduce Interview Questions

Questions Answers Views Company eMail

How hadoop mapreduce works?

640

What is shuffling in mapreduce?

607

Can we rename the output file?

685

What do sorting and shuffling do?

696

Explain about the partitioning, shuffle and sort phase

671

What are the four basic parameters of a reducer?

653

what is distributed cache in mapreduce framework?

673

What is the inputsplit in map reduce software?

620

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

696

Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

602

Can MapReduce program be written in any language other than Java?

928

How to set which framework would be used to run mapreduce program?

684

List out Hadoop's three configuration files?

603

Mention Hadoop core components?

657

What is RecordReader in a Map Reduce?

644

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Un-Answered Questions { MapReduce }

What is RecordReader in a Map Reduce?

644

What is the difference between Reducer and Combiner in Hadoop MapReduce?

677

What is a partitioner and how the user can control which key will go to which reducer?

939

What do you know about nlineinputformat?

683

What is SequenceFileInputFormat?

817

What is mapreduce algorithm?

588

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

676

How do reducers communicate with each other?

667

Explain about the partitioning, shuffle and sort phase in MapReduce?

819

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

696

How to configure the number of the Combiner in MapReduce?

625

What is the Hadoop MapReduce API contract for a key and value Class?

1292

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

666

Explain how do ‘map’ and ‘reduce’ work?

607

How to write a custom partitioner for a Hadoop MapReduce job?

651

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