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

MapReduce Interview Questions

Questions Answers Views Company eMail

What are combiners? When should I use a combiner in my MapReduce Job?

898

In Map Reduce why map write output to Local Disk instead of HDFS?

901

What is a partitioner and how the user can control which key will go to which reducer?

937

How does Mappers run method works?

890

How does MapReduce framework view its input internally?

866

What are the steps involved in MapReduce framework?

978

What is the Job interface in MapReduce framework?

905

How to overwrite an existing output file during execution of mapreduce jobs?

MRO,

1090

Detail description of the Reducer phases?

850

Can there be no Reducer?

838

What is the utility of using Writable Comparable Custom Class in Map Reduce code?

987

What is the core of the job in MapReduce framework?

847

MapReduce Types and Formats and Setting up a Hadoop Cluster?

903

It can be possible that a Job has 0 reducers?

963

Why Mapreduce output written in local disk?

997

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Un-Answered Questions { MapReduce }

Is reduce-only job possible in Hadoop MapReduce?

695

What is Reducer in MapReduce?

728

Where the mapper's intermediate data will be stored?

634

Why do we need MapReduce during Pig programming?

641

Developing a MapReduce Application?

962

What is an identity mapper and identity reducer?

602

How do ‘map’ and ‘reduce’ work?

648

What is SequenceFileInputFormat?

813

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

644

Can MapReduce program be written in any language other than Java?

926

What is a distributed cache in mapreduce framework?

603

How does fault tolerance work in mapreduce?

623

Why Hadoop MapReduce?

663

What is the role of recordreader in hadoop mapreduce?

732

When is it not recommended to use MapReduce paradigm for large

640

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