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

MapReduce Interview Questions

Questions Answers Views Company eMail

Explain the differences between a combiner and reducer

718

What is a TaskInstance?

704

What is the default input type in MapReduce?

711

How does fault tolerance work in mapreduce?

680

What is a scarce system resource?

707

With the help of two examples name the map and reduce function purpose

688

Write a short note on the disadvantages of mapreduce

641

Explain what you understand by speculative execution

661

Explain combiners.

675

when do reducers play their role in a mapreduce task?

651

In mapreduce what is a scarce system resource? Explain?

707

What do you understand by mapreduce?

689

Explain how mapreduce works.

663

What is an input reader in reference to mapreduce?

659

How is mapreduce related to cloud computing?

704

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Un-Answered Questions { MapReduce }

How do ‘map’ and ‘reduce’ work?

701

Explain the input type/format in mapreduce by default?

618

What is InputFormat in Hadoop MapReduce?

715

How many Mappers run for a MapReduce job in Hadoop?

648

how to proceed to write your first mapreducer program?

1412

what are the most common input formats defined in Hadoop?

694

What is the InputSplit in map reduce ?

1074

What is heartbeat in hdfs?

701

Mention what is the next step after mapper or maptask?

689

When should you use a reducer?

676

What is the purpose of textinputformat?

735

Explain slot in Hadoop Map-Reduce v1?

730

Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

649

mapper or reducer?

1037

Write a Mapreduce Program for Character Count ?

1094

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