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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is identity mapper and reducer? In which cases can we use them?

965

Is YARN a replacement of Hadoop MapReduce?

1 1941

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1172

What is the Hadoop MapReduce API contract for a key and value Class?

1244

Explain the Reducer's Sort phase?

839

What can be optimum value for Reducer?

900

When is the reducers are started in a MapReduce job?

826

What is the input type/format in MapReduce by default?

1040

What is the default value of map and reduce max attempts?

893

What is the Reducer used for?

887

What comes in Hadoop 2.0 and MapReduce V2 YARN

961

Why comparison of types is important for MapReduce?

915

What is the InputSplit in map reduce ?

987

what are the basic parameters of a Mapper?

774

What is a MapReduce Combiner?

747

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Un-Answered Questions { MapReduce }

how to proceed to write your first mapreducer program?

1304

What is the difference between map and reduce?

575

When Namenode is down what happens to job tracker?

641

Explain about the partitioning, shuffle and sort phase

629

What is the problem with the small file in Hadoop?

607

What is the core of the job in MapReduce framework?

794

What main configuration parameters are specified in mapreduce?

635

Write a Mapreduce Program for Character Count ?

1004

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

596

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

652

What is Hadoop Map Reduce ?

765

Explain the input type/format in mapreduce by default?

548

How do reducers communicate with each other?

601

What is Combiner in MapReduce?

593

What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

599

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