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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is MapReduce?

1 1920

What MapReduce framework consists of?

1143

Can we submit the mapreduce job from slave node?

1160

How can we control particular key should go in a specific reducer?

955

How can you add the arbitrary key-value pairs in your mapper?

1473

What is Reduce only jobs?

1 1772

What is a IdentityMapper and IdentityReducer in MapReduce ?

990

Explain Working of MapReduce?

1027

Write a Mapreduce Program for Character Count ?

1095

how to proceed to write your first mapreducer program?

1413

How to set the number of reducers?

1421

Developing a MapReduce Application?

1016

Different ways of debugging a job in MapReduce?

1145

Explain the Reducer's reduce phase?

1108

mapper or reducer?

1038

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Un-Answered Questions { MapReduce }

How many times combiner is called on a mapper node in Hadoop?

689

What is the best way to copy files between HDFS clusters?

713

What is the purpose of textinputformat?

739

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

736

What is SequenceFileInputFormat in Hadoop MapReduce?

665

How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

658

What is heartbeat in hdfs?

702

What is the fundamental difference between a MapReduce InputSplit and HDFS block?

667

What do you mean by inputformat?

654

What is a "map" in Hadoop?

834

What combiners are and when you should use a combiner in a mapreduce job?

653

Explain about the partitioning, shuffle and sort phase

723

What is mapreduce algorithm?

638

mapper or reducer?

1038

Explain what does the conf.setmapper class do?

662

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