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

650

What is a TaskInstance?

668

What is the default input type in MapReduce?

661

How does fault tolerance work in mapreduce?

625

What is a scarce system resource?

653

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

638

Write a short note on the disadvantages of mapreduce

600

Explain what you understand by speculative execution

606

Explain combiners.

629

when do reducers play their role in a mapreduce task?

616

In mapreduce what is a scarce system resource? Explain?

669

What do you understand by mapreduce?

647

Explain how mapreduce works.

610

What is an input reader in reference to mapreduce?

622

How is mapreduce related to cloud computing?

659

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Un-Answered Questions { MapReduce }

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

671

What is the key- value pair in Hadoop MapReduce?

679

What do you mean by shuffling and sorting in MapReduce?

699

What is SequenceFileInputFormat in Hadoop MapReduce?

627

Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?

677

What is reduce side join in mapreduce?

615

Explain the process of spilling in Hadoop MapReduce?

632

When Namenode is down what happens to job tracker?

699

What is shuffling and sorting in mapreduce?

642

Is it possible to rename the output file?

791

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

903

What is streaming?

681

Why can aggregation not be done in Mapper in MapReduce?

609

Explain the process of spilling in MapReduce?

597

What is the role of recordreader in hadoop mapreduce?

734

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