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

609

What is a TaskInstance?

635

What is the default input type in MapReduce?

627

How does fault tolerance work in mapreduce?

589

What is a scarce system resource?

622

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

597

Write a short note on the disadvantages of mapreduce

573

Explain what you understand by speculative execution

568

Explain combiners.

601

when do reducers play their role in a mapreduce task?

588

In mapreduce what is a scarce system resource? Explain?

628

What do you understand by mapreduce?

603

Explain how mapreduce works.

580

What is an input reader in reference to mapreduce?

596

How is mapreduce related to cloud computing?

617

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Un-Answered Questions { MapReduce }

Define speculative execution?

687

What are the fundamental configurations parameters specified in map reduce?

583

What is Combiner in MapReduce?

604

What happen if the number of the reducer is 0 in MapReduce?

612

Explain task granularity

600

what happens in textinformat ?

632

Where the mapper's intermediate data will be stored?

599

how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

755

How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

738

What is the difference between an RDBMS and Hadoop?

614

what is storage and compute nodes?

705

What is the key- value pair in Hadoop MapReduce?

644

Can we submit the mapreduce job from slave node?

1060

What is an input reader in reference to mapreduce?

596

How do ‘map’ and ‘reduce’ work?

615

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