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MapReduce Interview Questions
Questions Answers Views Company eMail

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

 739

Is YARN a replacement of Hadoop MapReduce?

 1 1541

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

 868

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

 1009

Explain the Reducer's Sort phase?

 611

What can be optimum value for Reducer?

 572

When is the reducers are started in a MapReduce job?

 572

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

 759

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

 653

What is the Reducer used for?

 663

What comes in Hadoop 2.0 and MapReduce V2 YARN

 699

Why comparison of types is important for MapReduce?

 673

What is the InputSplit in map reduce ?

 742

what are the basic parameters of a Mapper?

 504

What is a MapReduce Combiner?

 510

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Un-Answered Questions { MapReduce }

Difference between mapreduce and spark

384

What are the data components used by Hadoop?

422

What is Hadoop Map Reduce ?

535

Define speculative execution?

398

What is the purpose of textinputformat?

430




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

759

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

386

Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

349

Which Sorting algorithm is used in Hadoop MapReduce?

338

How to write MapReduce Programs?

397

What is a scarce system resource?

385

Explain the difference between a MapReduce InputSplit and HDFS block?

394

Explain JobConf in MapReduce.

517

Explain what is distributed cache in mapreduce framework?

358

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

424

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