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?

590

What is MapReduce in Hadoop?

640

Why Hadoop MapReduce?

666

Why can aggregation not be done in Mapper in MapReduce?

609

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

671

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

610

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

667

Explain slot in Hadoop Map-Reduce v1?

688

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

652

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

668

What are the main configuration parameters in a MapReduce program?

636

What do you mean by shuffling and sorting in MapReduce?

699

What is Combiner in MapReduce?

641

Where sorting is done in Hadoop MapReduce Job?

650

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

671

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Un-Answered Questions { MapReduce }

What is shuffling in mapreduce?

607

What main configuration parameters are specified in mapreduce?

677

Which Sorting algorithm is used in Hadoop MapReduce?

599

For a job in Hadoop, is it possible to change the number of mappers to be created?

788

Clarify what combiners are and when you should utilize a combiner in a map reduce job?

593

What is the difference between a MapReduce InputSplit and HDFS block?

752

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

595

what is distributed cache in mapreduce framework?

675

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

699

How data is spilt in Hadoop?

644

Detail description of the Reducer phases?

852

Compare Pig vs Hive vs Hadoop MapReduce?

675

What is the function of mapreducer partitioner?

616

Write a Mapreduce Program for Character Count ?

1053

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

615

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