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?

617

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

662

What is shuffling and sorting in Hadoop MapReduce?

595

Define the Use of MapReduce?

624

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

648

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

671

Explain the process of spilling in MapReduce?

570

What is LazyOutputFormat in MapReduce?

639

What is Output Format in MapReduce?

664

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

577

What are the identity mapper and reducer in MapReduce?

742

How to optimize Hadoop MapReduce Job?

608

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

678

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

621

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

585

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Un-Answered Questions { MapReduce }

how Hadoop is different from other data processing tools?

617

What is the process of changing the split size if there is limited storage space on Commodity Hardware?

658

What counter in Hadoop MapReduce?

610

How does Mappers run method works?

846

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

901

Explain Working of MapReduce?

928

Differentiate Reducer and Combiner in Hadoop MapReduce?

642

What is the InputSplit in map reduce ?

996

What is the need of MapReduce?

590

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

621

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

616

How to change a number of mappers running on a slave in MapReduce?

764

What are the main components of MapReduce Job?

647

What are the various configuration parameters required to run a mapreduce job?

621

What is the need of MapReduce in Hadoop?

603

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