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?

631

What is the difference between Hadoop and RDBMS?

583

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

630

Illustrate a simple example of the working of MapReduce.

575

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

606

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

652

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?

585

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

651

how Hadoop is different from other data processing tools?

596

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

568

what is a sequence file in Hadoop?

634

What are the key differences between Pig vs MapReduce?

558

When is it not recommended to use MapReduce paradigm for large

575

what happens in textinformat ?

617

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Un-Answered Questions { MapReduce }

When Namenode is down what happens to job tracker?

641

Define Writable data types in Hadoop MapReduce?

599

When is the reducers are started in a MapReduce job?

826

What is the need of MapReduce?

582

Explain about the basic parameters of mapper and reducer function

1008

Explain what are the basic parameters of a mapper?

754

What are the four essential parameters of a mapper?

604

What is partitioning in MapReduce?

663

What are the steps involved in MapReduce framework?

932

What are the main components of MapReduce Job?

636

What is shuffleing in mapreduce?

598

What are the key differences between Pig vs MapReduce?

558

what is Speculative Execution?

786

Explain combiners.

586

In MapReduce Data Flow, when Combiner is called?

601

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