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

MapReduce Interview Questions

Questions Answers Views Company eMail

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

695

In MapReduce, ideally how many mappers should be configured on a slave?

703

What counter in Hadoop MapReduce?

693

What is SequenceFileInputFormat in Hadoop MapReduce?

666

How many Mappers run for a MapReduce job in Hadoop?

649

How many Mappers run for a MapReduce job?

654

How do Hadoop MapReduce works?

781

What is a Distributed Cache in Hadoop?

697

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

679

What is the problem with the small file in Hadoop?

683

How many Reducers run for a MapReduce job?

740

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

736

How to set the number of mappers to be created in MapReduce?

688

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

890

What is Reducer in MapReduce?

771

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Un-Answered Questions { MapReduce }

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

695

What is a scarce system resource?

708

In Hadoop what is InputSplit?

680

Write a Mapreduce Program for Character Count ?

1095

what is a sequence file in Hadoop?

731

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

736

What is the use of InputFormat in MapReduce process?

703

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

777

What is the difference between an RDBMS and Hadoop?

687

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

736

what is WebDAV in Hadoop?

786

What do you mean by inputformat?

654

What happens when a datanode fails ?

831

Define MapReduce?

737

What is the role of a MapReduce partitioner?

856

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