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

MapReduce Interview Questions

Questions Answers Views Company eMail

In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

645

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

625

What is the relation between MapReduce and Hive?

643

What are advantages of Spark over MapReduce?

691

What is the use of InputFormat in MapReduce process?

651

What is Counter in MapReduce?

676

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

752

How to compress mapper output in Hadoop?

676

Why is Apache Spark faster than Hadoop MapReduce?

656

Define MapReduce?

689

Where is the output of Mapper written in Hadoop?

772

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

677

Explain the difference between a MapReduce InputSplit and HDFS block?

657

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

602

How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?

604

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Un-Answered Questions { MapReduce }

What is shuffleing in mapreduce?

648

How to specify more than one directory as input to the MapReduce Job?

697

What is the function of mapreduce partitioner?

639

What is a MapReduce Combiner?

795

What is a partitioner and how the user can control which key will go to which reducer?

939

What are the various InputFormats in Hadoop?

650

What combiners are and when you should use a combiner in a mapreduce job?

598

Can you tell us how many daemon processes run on a hadoop system?

593

What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

876

What are the benefits of Spark over MapReduce?

643

What is the difference between Job and Task in MapReduce?

614

Is it important for Hadoop MapReduce jobs to be written in Java?

845

Why can aggregation not be done in Mapper in MapReduce?

609

what is Speculative Execution?

832

What is partitioning in MapReduce?

717

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