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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is Shuffling and Sorting in a MapReduce?

713

What is the difference between Hadoop and RDBMS?

677

how can you check whether Namenode is working beside using the jps command?

723

Illustrate a simple example of the working of MapReduce.

677

For a Hadoop job, how will you write a custom partitioner?

706

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

736

what is the Hadoop MapReduce APIs contract for a key and value class?

703

When is it suggested to use a combiner in a MapReduce job?

684

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

760

how Hadoop is different from other data processing tools?

696

List the configuration parameters that have to be specified when running a MapReduce job.

640

what is a sequence file in Hadoop?

731

What are the key differences between Pig vs MapReduce?

655

When is it not recommended to use MapReduce paradigm for large

688

what happens in textinformat ?

709

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Un-Answered Questions { MapReduce }

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

777

Explain about the basic parameters of mapper and reducer function

1097

How many InputSplits is made by a Hadoop Framework?

713

Where is Mapper output stored?

896

What is the relation between MapReduce and Hive?

689

Where the mapper's intermediate data will be stored?

676

What is KeyValueTextInputFormat in Hadoop MapReduce?

854

What comes in Hadoop 2.0 and MapReduce V2 YARN

1041

Explain task granularity

688

What do you understand by compute and storage nodes?

724

What is the difference between Reducer and Combiner in Hadoop MapReduce?

724

What is the Reducer used for?

975

What are the data components used by Hadoop?

783

what does the conf.setMapper Class do ?

859

what is "map" and what is "reducer" in Hadoop?

681

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