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MapReduce Interview Questions
Questions Answers Views Company eMail

How many times combiner is called on a mapper node in Hadoop?

 386

Explain about the partitioning, shuffle and sort phase in MapReduce?

 498

Does Partitioner run in its own JVM or shares with another process?

 374

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

 351

What is Distributed Cache in the MapReduce Framework?

 360

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

 402

Is reduce-only job possible in Hadoop MapReduce?

 397

How to optimize MapReduce Job?

 404

In MapReduce how to change the name of the output file from part-r-00000?

 392

In MapReduce Data Flow, when Combiner is called?

 355

Differentiate Reducer and Combiner in Hadoop MapReduce?

 412

What is the key- value pair in MapReduce?

 384

A number of combiners can be changed or not in MapReduce?

 364

How to write a custom partitioner for a Hadoop MapReduce job?

 375

What is the need of MapReduce in Hadoop?

 370

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Un-Answered Questions { MapReduce }

Can we rename the output file?

388

How to get the single file as the output from MapReduce Job?

371

What are the various InputFormats in Hadoop?

374

How to write a custom partitioner for a Hadoop MapReduce job?

375

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

353




Is it mandatory to set input and output type/format in MapReduce?

441

How many Reducers run for a MapReduce job?

444

What is InputFormat in Hadoop MapReduce?

365

Define the Use of MapReduce?

365

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

351

What is difference between an input split and hdfs block?

358

Explain what does the conf.setMapper Class do in MapReduce?

378

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

492

What does conf.setmapper class do?

392

Is it possible to split 100 lines of input as a single split in MapReduce?

592

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