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?

1005

Is YARN a replacement of Hadoop MapReduce?

1 2020

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

1213

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

1291

Explain the Reducer's Sort phase?

882

What can be optimum value for Reducer?

946

When is the reducers are started in a MapReduce job?

861

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

1069

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

930

What is the Reducer used for?

922

What comes in Hadoop 2.0 and MapReduce V2 YARN

1002

Why comparison of types is important for MapReduce?

955

What is the InputSplit in map reduce ?

1022

what are the basic parameters of a Mapper?

812

What is a MapReduce Combiner?

794

Post New MapReduce Questions

Un-Answered Questions { MapReduce }

Is it possible to split 100 lines of input as a single split in MapReduce?

963

Compare RDBMS with Hadoop MapReduce.

629

what does the text input format do?

814

How do ‘map’ and ‘reduce’ work?

649

Explain about the basic parameters of mapper and reducer function

1046

Explain Working of MapReduce?

969

What happens when the node running the map task fails before the map output has been sent to the reducer?

647

Is it possible to search for files using wildcards?

641

Explain how mapreduce works.

609

What happens when a datanode fails ?

777

Explain task granularity

647

Define MapReduce?

688

What is the need of MapReduce?

631

What is identity mapper and identity reducer?

643

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

1213

For More Un-Answered { MapReduce } Questions Click Here