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?

1006

Is YARN a replacement of Hadoop MapReduce?

1 2020

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

1214

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

1292

Explain the Reducer's Sort phase?

884

What can be optimum value for Reducer?

947

When is the reducers are started in a MapReduce job?

862

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

1070

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

932

What is the Reducer used for?

923

What comes in Hadoop 2.0 and MapReduce V2 YARN

1003

Why comparison of types is important for MapReduce?

956

What is the InputSplit in map reduce ?

1026

what are the basic parameters of a Mapper?

813

What is a MapReduce Combiner?

795

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Un-Answered Questions { MapReduce }

how Hadoop is different from other data processing tools?

646

Explain about the partitioning, shuffle and sort phase

671

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

770

Different ways of debugging a job in MapReduce?

1106

what is storage and compute nodes?

736

Why Mapreduce output written in local disk?

999

Explain the general mapreduce algorithm

646

What is the job of blend () and repartition () in Map Reduce?

639

What is InputFormat in Hadoop MapReduce?

666

Explain the Reducer's Sort phase?

884

What is a Speculative Execution in Hadoop MapReduce?

653

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

677

When the reducers are are started in a mapreduce job?

595

Explain Working of MapReduce?

971

What is the need of key-value pair to process the data in MapReduce?

668

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