MapReduce Interview Questions
Questions Answers Views Company eMail

Define Writable data types in Hadoop MapReduce?

346

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

384

What is shuffling and sorting in Hadoop MapReduce?

358

Define the Use of MapReduce?

355

Whether the output of mapper or output of partitioner written on local disk?

379

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

379

Explain the process of spilling in MapReduce?

334

What is LazyOutputFormat in MapReduce?

373

What is Output Format in MapReduce?

394

Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

337

What are the identity mapper and reducer in MapReduce?

458

How to optimize Hadoop MapReduce Job?

355

How to specify more than one directory as input in the Hadoop MapReduce Program?

393

How to change the name of the output file from part-r-00000 in Hadoop MapReduce?

361

Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

346


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Un-Answered Questions { MapReduce }

Name job control options specified by mapreduce.

414


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

480


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

363


What are the data components used by Hadoop?

416


Explain the Reducer's reduce phase?

688






What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

384


Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?

369


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

330


How data is spilt in Hadoop?

376


What are the identity mapper and reducer in MapReduce?

458


Can we set the number of reducers to zero in MapReduce?

389


Define Writable data types in Hadoop MapReduce?

346


What is Combiner in MapReduce?

358


Define the purpose of the partition function in mapreduce framework

396


What is Reducer in MapReduce?

399