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

MapReduce Interview Questions

Questions Answers Views Company eMail

What are the advantages of using mapreduce with hadoop?

634

What do you know about nlineinputformat?

735

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

713

What is the role of recordreader in hadoop mapreduce?

787

What happens when the node running the map task fails before the map output has been sent to the reducer?

692

Define speculative execution?

763

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

702

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

688

What is a map side join?

722

What is a combiner and where you should use it?

710

When should you use sequencefileinputformat?

710

What is the purpose of textinputformat?

739

What is reduce side join in mapreduce?

652

What do you mean by inputformat?

654

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

715

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Un-Answered Questions { MapReduce }

When should you use sequencefileinputformat?

710

What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

890

How many times combiner is called on a mapper node in Hadoop?

689

What is the need of MapReduce?

686

What is the Reducer used for?

975

Explain what are the basic parameters of a mapper?

861

What do sorting and shuffling do?

744

What is a Speculative Execution in Hadoop MapReduce?

696

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

650

What are the various InputFormats in Hadoop?

690

Explain the differences between a combiner and reducer

719

what are the most common input formats defined in Hadoop?

695

What is the Hadoop MapReduce API contract for a key and value Class?

1342

Explain what is distributed cache in mapreduce framework?

669

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

728

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