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

MapReduce Interview Questions

Questions Answers Views Company eMail

Explain InputSplit in Hadoop MapReduce?

385

How much space will the split occupy in Mapreduce?

393

What is a RecordReader in Hadoop MapReduce?

390

What is the difference between HDFS block and input split?

455

How to write MapReduce Programs?

393

What is the difference between an RDBMS and Hadoop?

406

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

455

What is the data storage component used by Hadoop?

358

When is it not recommended to use MapReduce paradigm for large scale data processing?

384

What is sqoop in Hadoop ?

398

What do you understand by the term Straggler ?

387

Explain about the basic parameters of mapper and reducer function

775

How many InputSplits is made by a Hadoop Framework?

346

What do you understand by compute and storage nodes?

371

Explain job scheduling through JobTracker

401

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Un-Answered Questions { MapReduce }

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

369

How do you stop a running job gracefully?

360

What are the data components used by Hadoop?

420

When is the reducers are started in a MapReduce job?

570

What is KeyValueTextInputFormat in Hadoop MapReduce?

514

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

408

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

358

What combiners are and when you should utilize a combiner in a map reduce job?

347

What is shuffling and sorting in mapreduce?

374

What is the difference between Hadoop and RDBMS?

353

how can you debug Hadoop code?

510

Why MapReduce uses the key-value pair to process the data?

346

what are the main configuration parameters that user need to specify to run Mapreduce Job ?

361

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

373

In Hadoop, which file controls reporting in Hadoop?

483

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