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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is the difference between Job and Task in MapReduce?

575

Compare Pig vs Hive vs Hadoop MapReduce?

627

What is the fundamental difference between a MapReduce InputSplit and HDFS block?

583

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

600

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

591

Why is output file name in Hadoop MapReduce part-r-00000?

573

Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

555

Explain the process of spilling in Hadoop MapReduce?

584

What Are Good Use Cases For Impala As Opposed To Hive Or MapReduce?

563

What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

600

What are the benefits of Spark over MapReduce?

577

What are the disservices of utilizing Apache Spark over Hadoop MapReduce?

581

Why do we need MapReduce during Pig programming?

604

What is difference between a MapReduce InputSplit and HDFS block

633

What is the job of blend () and repartition () in Map Reduce?

598

Post New MapReduce Questions

Un-Answered Questions { MapReduce }

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

658

What is the difference between a MapReduce InputSplit and HDFS block?

692

What does a split do?

580

When is it suggested to use a combiner in a MapReduce job?

585

How to optimize MapReduce Job?

617

Which are the methods in the mapper interface?

582

when do reducers play their role in a mapreduce task?

583

How many Reducers run for a MapReduce job?

647

What is the job of blend () and repartition () in Map Reduce?

598

What is optimal size of a file for distributed cache?

589

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

602

How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

591

What is Shuffling and Sorting in a MapReduce?

632

In Hadoop, which file controls reporting in Hadoop?

742

How to set the number of reducers?

1316

For More Un-Answered { MapReduce } Questions Click Here