MapReduce Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

437

What MapReduce framework consists of?

427

Can we submit the mapreduce job from slave node?

495




How can we control particular key should go in a specific reducer?

304

How can you add the arbitrary key-value pairs in your mapper?

440

What is Reduce only jobs?

270

What is a IdentityMapper and IdentityReducer in MapReduce ?

287

Explain Working of MapReduce?

315




Write a Mapreduce Program for Character Count ?

380

how to proceed to write your first mapreducer program?

697

How to set the number of reducers?

616

Developing a MapReduce Application?

295

Different ways of debugging a job in MapReduce?

445

Explain the Reducer's reduce phase?

340

mapper or reducer?

252


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Un-Answered Questions { MapReduce }

What is the difference between Job and Task in MapReduce?

47


What are the various InputFormats in Hadoop?

49


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

29


What is Output Format in MapReduce?

43


How hadoop mapreduce works?

31






How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

14


what job does the conf class do?

151


How does inputsplit in mapreduce determines the record boundaries correctly?

48


Can we submit the mapreduce job from slave node?

495


What do sorting and shuffling do?

38


Explain the difference between a MapReduce InputSplit and HDFS block?

45


What is the difference between an RDBMS and Hadoop?

53


What is the need of MapReduce?

31


List out Hadoop's three configuration files?

27


In mapreduce what is a scarce system resource? Explain?

27