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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is a distributed cache in mapreduce framework?

604

What do you mean by data locality?

671

How can we assure that the values regarding a particular key goes to the same reducer?

605

What are ‘reduces’?

701

Explain how do ‘map’ and ‘reduce’ work?

606

How do ‘map’ and ‘reduce’ work?

648

Explain the input type/format in mapreduce by default?

579

What is the difference between map and reduce?

625

What is optimal size of a file for distributed cache?

635

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Un-Answered Questions { MapReduce }

What is shuffling in mapreduce?

605

Is there any point of learning mapreduce, then?

644

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

670

What is the role of recordreader in hadoop mapreduce?

732

How does MapReduce framework view its input internally?

867

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

710

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

1290

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

712

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

664

How many Mappers run for a MapReduce job?

607

what daemons run on a master node and slave nodes?

699

What is difference between a MapReduce InputSplit and HDFS block

674

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

608

How is reporting controlled in hadoop?

780

How many Reducers run for a MapReduce job in Hadoop?

590

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