MapReduce Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

1 1081

What MapReduce framework consists of?

753

Can we submit the mapreduce job from slave node?

832

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

630

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

963

What is Reduce only jobs?

1 923

What is a IdentityMapper and IdentityReducer in MapReduce ?

627

Explain Working of MapReduce?

649

Write a Mapreduce Program for Character Count ?

692

how to proceed to write your first mapreducer program?

1017

How to set the number of reducers?

1019

Developing a MapReduce Application?

637

Different ways of debugging a job in MapReduce?

790

Explain the Reducer's reduce phase?

688

mapper or reducer?

611


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Un-Answered Questions { MapReduce }

What is identity mapper and chain mapper?

354


Mention what is the hadoop mapreduce apis contract for a key and value class?

407


What is the need of MapReduce in Hadoop?

359


What are the steps involved in MapReduce framework?

601


What combiners is and when you should use a combiner in a MapReduce Job?

358






what is Speculative Execution?

516


What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

384


In MapReduce how to change the name of the output file from part-r-00000?

370


What is the function of mapreducer partitioner?

351


What happens if the quantity of the reducer is 0 in mapreduce?

329


Explain about the partitioning, shuffle and sort phase

374


What is MapReduce? What are the syntax you use to run a MapReduce program?

370


What is heartbeat in hdfs?

387


Can there be no Reducer?

566


What happens when the node running the map task fails before the map output has been sent to the reducer?

361