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MapReduce Interview Questions
Questions Answers Views Company eMail

What is Shuffling and Sorting in a MapReduce?

 415

What is the difference between Hadoop and RDBMS?

 365

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

 407

Illustrate a simple example of the working of MapReduce.

 388

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

 407

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

 419

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

 418

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

 391

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

 416

how Hadoop is different from other data processing tools?

 388

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

 372

what is a sequence file in Hadoop?

 419

What are the key differences between Pig vs MapReduce?

 362

When is it not recommended to use MapReduce paradigm for large

 375

what happens in textinformat ?

 400

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Un-Answered Questions { MapReduce }

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

416

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

379

For a job in Hadoop, is it possible to change the number of mappers to be created?

500

What is Distributed Cache in the MapReduce Framework?

363

Is it necessary to write a mapreduce job in java?

407




MapReduce Types and Formats and Setting up a Hadoop Cluster?

598

what is JobTracker in Hadoop? What are the actions followed by Hadoop?

528

Whether the output of mapper or output of partitioner written on local disk?

396

What is the Job interface in MapReduce framework?

647

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

391

What is a TaskInstance?

407

how to proceed to write your first mapreducer program?

1033

What are the configuration parameters in the 'MapReduce' program?

403

How to set which framework would be used to run mapreduce program?

419

What is a mapreduce algorithm?

374

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