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?

639

What is shuffling in mapreduce?

606

Can we rename the output file?

685

What do sorting and shuffling do?

696

Explain about the partitioning, shuffle and sort phase

670

What are the four basic parameters of a reducer?

652

what is distributed cache in mapreduce framework?

672

What is the inputsplit in map reduce software?

619

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

695

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

601

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

927

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

683

List out Hadoop's three configuration files?

602

Mention Hadoop core components?

656

What is RecordReader in a Map Reduce?

643

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Un-Answered Questions { MapReduce }

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

686

How do ‘map’ and ‘reduce’ work?

649

What are the advantages of using mapreduce with hadoop?

590

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

645

What is the function of mapreducer partitioner?

615

In MapReduce how to change the name of the output file from part-r-00000?

626

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

670

How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

824

How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

624

What is the need of key-value pair to process the data in MapReduce?

668

how JobTracker schedules a task ?

847

In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

644

What is KeyValueTextInputFormat in Hadoop MapReduce?

803

what is the Hadoop MapReduce APIs contract for a key and value class?

667

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

599

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