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

MapReduce Interview Questions

Questions Answers Views Company eMail

List the network requirements for using Hadoop ?

456

What is the next step after Mapper or MapTask?

490

What are the main components of MapReduce Job?

530

What is the relationship between Job and Task in Hadoop?

475

What combiners is and when you should use a combiner in a MapReduce Job?

474

How to set mappers and reducers for Hadoop jobs?

461

What are the data components used by Hadoop?

558

What is the best way to copy files between HDFS clusters?

498

Is it possible to search for files using wildcards?

476

In Hadoop what is InputSplit?

477

What is partitioning in MapReduce?

532

What is the difference between RDBMS with Hadoop MapReduce?

634

Explain what does the conf.setMapper Class do in MapReduce?

478

How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

583

What is a Speculative Execution in Hadoop MapReduce?

467

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Un-Answered Questions { MapReduce }

What is the key- value pair in MapReduce?

556

What is mapper in map reduce?

474

What is the Reducer used for?

770

What is a map side join?

514

What is a IdentityMapper and IdentityReducer in MapReduce ?

766

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

520

what happens in textinformat ?

498

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

1118

what daemons run on a master node and slave nodes?

530

How to overwrite an existing output file during execution of mapreduce jobs?

941

Write a Mapreduce Program for Character Count ?

835

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

561

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

457

What is Output Format in MapReduce?

530

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

566

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