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

MapReduce Interview Questions

Questions Answers Views Company eMail

How many Reducers run for a MapReduce job in Hadoop?

627

What is MapReduce in Hadoop?

689

Why Hadoop MapReduce?

698

Why can aggregation not be done in Mapper in MapReduce?

645

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

725

How many numbers of reducers run in Map-Reduce Job?

646

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

717

Explain slot in Hadoop Map-Reduce v1?

731

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

687

What is the need of key-value pair to process the data in MapReduce?

713

What are the main configuration parameters in a MapReduce program?

674

What do you mean by shuffling and sorting in MapReduce?

750

What is Combiner in MapReduce?

691

Where sorting is done in Hadoop MapReduce Job?

682

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

709

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Un-Answered Questions { MapReduce }

What is Hadoop Map Reduce ?

854

what are the most common input formats defined in Hadoop?

695

What is Reducer in MapReduce?

771

what job does the conf class do?

837

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

777

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

722

What are the identity mapper and reducer in MapReduce?

835

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

650

What is shuffling in mapreduce?

651

Explain the difference between a MapReduce InputSplit and HDFS block?

696

How hadoop mapreduce works?

689

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

702

Can we rename the output file?

728

What is the difference between HDFS block and input split?

934

Can you tell us how many daemon processes run on a hadoop system?

635

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