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

MapReduce Interview Questions

Questions Answers Views Company eMail

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

695

Explain what does the conf.setmapper class do?

662

Explain what are the basic parameters of a mapper?

861

Mention what is the next step after mapper or maptask?

690

Explain what is shuffling in mapreduce?

668

Explain what is distributed cache in mapreduce framework?

669

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

777

Explain what is the function of mapreduce partitioner?

676

What is map/reduce job in hadoop?

671

What is a mapreduce algorithm?

701

What is mapreduce algorithm?

638

When the reducers are are started in a mapreduce job?

650

Where the mapper's intermediate data will be stored?

676

Which are the methods in the mapper interface?

680

What is an identity mapper and identity reducer?

660

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Un-Answered Questions { MapReduce }

what job does the conf class do?

837

What is Data Locality in Hadoop?

714

What combiners is and when you should use a combiner in a MapReduce Job?

670

What is the inputsplit in map reduce software?

670

What does conf.setmapper class do?

714

MapReduce Types and Formats and Setting up a Hadoop Cluster?

955

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

671

what is JobTracker in Hadoop? What are the actions followed by Hadoop?

819

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

640

What is a IdentityMapper and IdentityReducer in MapReduce ?

990

how indexing in HDFS is done?

892

Which Sorting algorithm is used in Hadoop MapReduce?

636

What are the advantages of using mapreduce with hadoop?

634

What is Output Format in MapReduce?

734

Explain about the partitioning, shuffle and sort phase

723

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