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?

641

What is the difference between Hadoop and RDBMS?

597

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

638

Illustrate a simple example of the working of MapReduce.

587

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

621

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

662

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

634

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

593

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

660

how Hadoop is different from other data processing tools?

619

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

573

what is a sequence file in Hadoop?

647

What are the key differences between Pig vs MapReduce?

571

When is it not recommended to use MapReduce paradigm for large

587

what happens in textinformat ?

630

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Un-Answered Questions { MapReduce }

What is the relationship between Job and Task in Hadoop?

625

Name job control options specified by mapreduce.

672

how can you debug Hadoop code?

799

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

565

What is reduce side join in mapreduce?

574

Illustrate a simple example of the working of MapReduce.

587

Explain what is “map” and what is "reducer" in hadoop?

609

How many Mappers run for a MapReduce job in Hadoop?

579

What is partitioner and its usage?

641

Difference between mapreduce and spark

657

How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

625

what is a sequence file in Hadoop?

647

What does conf.setmapper class do?

625

When Namenode is down what happens to job tracker?

652

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

593

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