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?

660

What is the difference between Hadoop and RDBMS?

632

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

665

Illustrate a simple example of the working of MapReduce.

631

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?

691

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

668

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

636

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

708

how Hadoop is different from other data processing tools?

646

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

600

what is a sequence file in Hadoop?

677

What are the key differences between Pig vs MapReduce?

611

When is it not recommended to use MapReduce paradigm for large

646

what happens in textinformat ?

667

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Un-Answered Questions { MapReduce }

Define MapReduce?

690

what are the basic parameters of a Mapper?

813

what are the three modes in which Hadoop can be run?

627

When is it not recommended to use MapReduce paradigm for large

646

What are ‘maps’ and ‘reduces’?

696

What happens when a datanode fails ?

778

Why is output file name in Hadoop MapReduce part-r-00000?

629

What is the difference between map and reduce?

627

What is the Job interface in MapReduce framework?

907

What do sorting and shuffling do?

696

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

625

Mention Hadoop core components?

657

What is a scarce system resource?

653

What is a Speculative Execution in Hadoop MapReduce?

653

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

671

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