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

MapReduce Interview Questions

Questions Answers Views Company eMail

Explain what is “map” and what is "reducer" in hadoop?

644

Explain what does the conf.setmapper class do?

611

Explain what are the basic parameters of a mapper?

804

Mention what is the next step after mapper or maptask?

632

Explain what is shuffling in mapreduce?

627

Explain what is distributed cache in mapreduce framework?

616

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

731

Explain what is the function of mapreduce partitioner?

640

What is map/reduce job in hadoop?

642

What is a mapreduce algorithm?

637

What is mapreduce algorithm?

587

When the reducers are are started in a mapreduce job?

595

Where the mapper's intermediate data will be stored?

638

Which are the methods in the mapper interface?

634

What is an identity mapper and identity reducer?

604

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Un-Answered Questions { MapReduce }

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

610

What are ‘reduces’?

703

What is an input reader in reference to mapreduce?

622

Define Writable data types in MapReduce?

675

When Namenode is down what happens to job tracker?

699

What is Reducer in MapReduce?

731

What happens when a datanode fails ?

778

How to specify more than one directory as input to the MapReduce Job?

697

How to optimize MapReduce Job?

649

What is a map side join?

685

In Hadoop what is InputSplit?

630

Clarify what is shuffling in map reduce?

634

What is a combiner and where you should use it?

663

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

646

What is SequenceFileInputFormat in Hadoop MapReduce?

627

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