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

MapReduce Interview Questions

Questions Answers Views Company eMail

How is reporting controlled in hadoop?

736

What is Hadoop Map Reduce ?

765

what does the text input format do?

770

What happens when a datanode fails ?

727

In Hadoop, which file controls reporting in Hadoop?

742

how can you debug Hadoop code?

786

For a job in Hadoop, is it possible to change the number of mappers to be created?

735

What are the primary phases of a Reducer?

767

how indexing in HDFS is done?

812

What is the role of a MapReduce partitioner?

770

Is it important for Hadoop MapReduce jobs to be written in Java?

776

what job does the conf class do?

743

What is the key- value pair in Hadoop MapReduce?

632

What is InputFormat in Hadoop MapReduce?

615

What are the various InputFormats in Hadoop?

609

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Un-Answered Questions { MapReduce }

Compare RDBMS with Hadoop MapReduce.

585

What is the InputSplit in map reduce ?

987

Explain what you understand by speculative execution

560

Difference between mapreduce and spark

648

What do sorting and shuffling do?

641

What are the four basic parameters of a reducer?

612

What is the need of MapReduce?

583

Explain what is shuffling in mapreduce?

576

What are the advantages of using map side join in mapreduce?

604

What is the Reducer used for?

887

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?

635

What is LazyOutputFormat in MapReduce?

634

How many InputSplits is made by a Hadoop Framework?

580

What is the function of mapreduce partitioner?

588

What platform and Java version is required to run Hadoop?

600

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