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

MapReduce Interview Questions

Questions Answers Views Company eMail

Explain InputSplit in Hadoop MapReduce?

720

How much space will the split occupy in Mapreduce?

718

What is a RecordReader in Hadoop MapReduce?

715

What is the difference between HDFS block and input split?

934

How to write MapReduce Programs?

755

What is the difference between an RDBMS and Hadoop?

687

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

746

What is the data storage component used by Hadoop?

675

When is it not recommended to use MapReduce paradigm for large scale data processing?

719

What is sqoop in Hadoop ?

740

What do you understand by the term Straggler ?

733

Explain about the basic parameters of mapper and reducer function

1097

How many InputSplits is made by a Hadoop Framework?

713

What do you understand by compute and storage nodes?

724

Explain job scheduling through JobTracker

772

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Un-Answered Questions { MapReduce }

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

736

What is heartbeat in hdfs? Explain.

738

Explain the differences between a combiner and reducer

719

What do you understand by the term Straggler ?

733

Name job control options specified by mapreduce.

754

What are the configuration parameters in the 'MapReduce' program?

709

How to create a custom key and custom value in MapReduce Job?

722

Is it mandatory to set input and output type/format in MapReduce?

787

What is Output Format in MapReduce?

734

Compare RDBMS with Hadoop MapReduce.

670

Where sorting is done in Hadoop MapReduce Job?

682

Describe what happens to a mapreduce job from submission to output?

719

what daemons run on a master node and slave nodes?

749

List out Hadoop's three configuration files?

659

Clarify what is shuffling in map reduce?

683

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