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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is Shuffling and Sorting in a MapReduce?

628

What is the difference between Hadoop and RDBMS?

581

how can you check whether Namenode is working beside using the jps command?

628

Illustrate a simple example of the working of MapReduce.

573

For a Hadoop job, how will you write a custom partitioner?

604

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

650

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

622

When is it suggested to use a combiner in a MapReduce job?

584

What is the process of changing the split size if there is limited storage space on Commodity Hardware?

649

how Hadoop is different from other data processing tools?

593

List the configuration parameters that have to be specified when running a MapReduce job.

566

what is a sequence file in Hadoop?

632

What are the key differences between Pig vs MapReduce?

556

When is it not recommended to use MapReduce paradigm for large

574

what happens in textinformat ?

617

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Un-Answered Questions { MapReduce }

how to proceed to write your first mapreducer program?

1303

What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

791

Explain the general mapreduce algorithm

598

Can there be no Reducer?

807

How many Mappers run for a MapReduce job?

561

Why Hadoop MapReduce?

624

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

598

What is identity mapper and chain mapper?

621

How to specify more than one directory as input to the MapReduce Job?

656

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

562

Explain the Reducer's Sort phase?

837

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

633

Mention when to use Map reduce mode?

589

How do Hadoop MapReduce works?

669

What is the Reducer used for?

886

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