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?

659

What is the difference between Hadoop and RDBMS?

630

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

663

Illustrate a simple example of the working of MapReduce.

629

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

651

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

688

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

667

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

635

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

706

how Hadoop is different from other data processing tools?

645

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

599

what is a sequence file in Hadoop?

675

What are the key differences between Pig vs MapReduce?

610

When is it not recommended to use MapReduce paradigm for large

641

what happens in textinformat ?

666

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Un-Answered Questions { MapReduce }

When should you use sequencefileinputformat?

660

Detail description of the Reducer phases?

850

Mention what is the next step after mapper or maptask?

629

how JobTracker schedules a task ?

847

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

634

Explain about the partitioning, shuffle and sort phase

670

Explain how mapreduce works.

609

Where the mapper's intermediate data will be stored?

635

What is shuffleing in mapreduce?

646

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

688

What is a "map" in Hadoop?

791

what is NameNode in Hadoop?

877

Why can aggregation not be done in Mapper in MapReduce?

607

what is a sequence file in Hadoop?

675

What is the next step after Mapper or MapTask?

641

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