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?

877

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

876

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

898

How does Mappers run method works?

846

How does MapReduce framework view its input internally?

839

What are the steps involved in MapReduce framework?

938

What is the Job interface in MapReduce framework?

876

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

MRO,

1059

Detail description of the Reducer phases?

816

Can there be no Reducer?

813

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

955

What is the core of the job in MapReduce framework?

809

MapReduce Types and Formats and Setting up a Hadoop Cluster?

886

It can be possible that a Job has 0 reducers?

938

Why Mapreduce output written in local disk?

965

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Un-Answered Questions { MapReduce }

How to set the number of mappers for a MapReduce job?

661

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

955

Explain the process of spilling in Hadoop MapReduce?

594

How to set the number of mappers to be created in MapReduce?

610

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

682

what is storage and compute nodes?

705

What is reduce side join in mapreduce?

573

A number of combiners can be changed or not in MapReduce?

607

For a Hadoop job, how will you write a custom partitioner?

621

How does inputsplit in mapreduce determines the record boundaries correctly?

620

What is the function of mapreducer partitioner?

572

How is mapreduce related to cloud computing?

617

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?

644

What is identity mapper and identity reducer?

620

Why Hadoop MapReduce?

644

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