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

MapReduce Interview Questions

Questions Answers Views Company eMail

Define Writable data types in Hadoop MapReduce?

683

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

748

What is shuffling and sorting in Hadoop MapReduce?

679

Define the Use of MapReduce?

713

Whether the output of mapper or output of partitioner written on local disk?

717

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

728

Explain the process of spilling in MapReduce?

643

What is LazyOutputFormat in MapReduce?

725

What is Output Format in MapReduce?

734

Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

656

What are the identity mapper and reducer in MapReduce?

835

How to optimize Hadoop MapReduce Job?

673

How to specify more than one directory as input in the Hadoop MapReduce Program?

768

How to change the name of the output file from part-r-00000 in Hadoop MapReduce?

697

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

650

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Un-Answered Questions { MapReduce }

What are the advantages of using map side join in mapreduce?

688

What is the default value of map and reduce max attempts?

972

Explain what are the basic parameters of a mapper?

861

What is Text Input Format?

711

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

747

What is the function of mapreducer partitioner?

674

what are the basic parameters of a Mapper?

862

Which are the methods in the mapper interface?

680

Why is output file name in Hadoop MapReduce part-r-00000?

670

What is Combiner in MapReduce?

691

How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?

656

what is "map" and what is "reducer" in Hadoop?

681

Where is the output of Mapper written in Hadoop?

844

How to set mappers and reducers for Hadoop jobs?

652

Define the Use of MapReduce?

713

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