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

MapReduce Interview Questions

Questions Answers Views Company eMail

What are the advantages of using mapreduce with hadoop?

433

What do you know about nlineinputformat?

499

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

496

What is the role of recordreader in hadoop mapreduce?

573

What happens when the node running the map task fails before the map output has been sent to the reducer?

482

Define speculative execution?

489

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

487

What are the advantages of using map side join in mapreduce?

466

What is a map side join?

502

What is a combiner and where you should use it?

472

When should you use sequencefileinputformat?

484

What is the purpose of textinputformat?

541

What is reduce side join in mapreduce?

428

What do you mean by inputformat?

441

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

484

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Un-Answered Questions { MapReduce }

What is the core of the job in MapReduce framework?

660

What is partitioner and its usage?

489

What is the purpose of textinputformat?

541

Explain task granularity

450

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

456

How to optimize MapReduce Job?

481

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

527

what is storage and compute nodes?

541

What are the identity mapper and reducer in MapReduce?

583

what daemons run on a master node and slave nodes?

511

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

498

What is Combiner in MapReduce?

467

Explain what is shuffling in mapreduce?

444

How to set the number of reducers?

1175

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

928

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