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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is identity mapper and reducer? In which cases can we use them?

837

Is YARN a replacement of Hadoop MapReduce?

1 1717

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1011

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

1105

Explain the Reducer's Sort phase?

705

What can be optimum value for Reducer?

676

When is the reducers are started in a MapReduce job?

690

What is the input type/format in MapReduce by default?

850

What is the default value of map and reduce max attempts?

750

What is the Reducer used for?

758

What comes in Hadoop 2.0 and MapReduce V2 YARN

802

Why comparison of types is important for MapReduce?

781

What is the InputSplit in map reduce ?

854

what are the basic parameters of a Mapper?

620

What is a MapReduce Combiner?

612

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Un-Answered Questions { MapReduce }

What is Hadoop Map Reduce ?

635

Compare Pig vs Hive vs Hadoop MapReduce?

487

What platform and Java version is required to run Hadoop?

471

What are the various configuration parameters required to run a mapreduce job?

484

What is a MapReduce Combiner?

612

What is an input reader in reference to mapreduce?

443

What is the difference between HDFS block and input split?

615

What is the input type/format in MapReduce by default?

850

what happens in textinformat ?

489

What is the function of mapreduce partitioner?

455

What is the data storage component used by Hadoop?

453

Explain the input type/format in mapreduce by default?

436

What is a "map" in Hadoop?

602

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

498

How to compress mapper output in Hadoop?

482

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