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MapReduce Interview Questions
Questions Answers Views Company eMail

Explain what is “map” and what is "reducer" in hadoop?

 367

Explain what does the conf.setmapper class do?

 338

Explain what are the basic parameters of a mapper?

 453

Mention what is the next step after mapper or maptask?

 375

Explain what is shuffling in mapreduce?

 348

Explain what is distributed cache in mapreduce framework?

 354

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

 424

Explain what is the function of mapreduce partitioner?

 367

What is map/reduce job in hadoop?

 350

What is a mapreduce algorithm?

 356

What is mapreduce algorithm?

 317

When the reducers are are started in a mapreduce job?

 339

Where the mapper's intermediate data will be stored?

 339

Which are the methods in the mapper interface?

 342

What is an identity mapper and identity reducer?

 343

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Un-Answered Questions { MapReduce }

Why is Apache Spark faster than Hadoop MapReduce?

362

What are the various input and output types supported by mapreduce?

356

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

373

What is identity mapper and identity reducer?

376

In mapreduce what is a scarce system resource? Explain?

386




Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

352

What is the difference between RDBMS with Hadoop MapReduce?

483

What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

605

What do you mean by inputformat?

345

Is it necessary to write a mapreduce job in java?

399

Why do we need MapReduce during Pig programming?

369

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

359

What is the difference between HDFS block and input split?

455

How do Hadoop MapReduce works?

408

Explain the Reducer's reduce phase?

695

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