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MapReduce Interview Questions
Questions Answers Views Company eMail

What is Shuffling and Sorting in a MapReduce?

 402

What is the difference between Hadoop and RDBMS?

 353

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

 399

Illustrate a simple example of the working of MapReduce.

 380

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

 385

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

 409

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

 408

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

 385

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

 406

how Hadoop is different from other data processing tools?

 378

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

 360

what is a sequence file in Hadoop?

 405

What are the key differences between Pig vs MapReduce?

 350

When is it not recommended to use MapReduce paradigm for large

 362

what happens in textinformat ?

 391

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Un-Answered Questions { MapReduce }

Why is Apache Spark faster than Hadoop MapReduce?

366

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

839

Describe what happens to a mapreduce job from submission to output?

360

What is heartbeat in hdfs? Explain.

361

What does conf.setmapper class do?

389




Explain about the basic parameters of mapper and reducer function

779

What are the disservices of utilizing Apache Spark over Hadoop MapReduce?

358

What is a distributed cache in mapreduce framework?

346

What are the main components of MapReduce Job?

415

What are the fundamental configurations parameters specified in map reduce?

337

How to create a custom key and custom value in MapReduce Job?

399

Where is Mapper output stored?

501

In Map Reduce why map write output to Local Disk instead of HDFS?

643

What is sqoop in Hadoop ?

400

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

375

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