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?

599

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

591

What is the relation between MapReduce and Hive?

585

What are advantages of Spark over MapReduce?

640

What is the use of InputFormat in MapReduce process?

615

What is Counter in MapReduce?

632

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

692

How to compress mapper output in Hadoop?

631

Why is Apache Spark faster than Hadoop MapReduce?

606

Define MapReduce?

646

Where is the output of Mapper written in Hadoop?

715

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

626

Explain the difference between a MapReduce InputSplit and HDFS block?

618

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

554

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

562

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Un-Answered Questions { MapReduce }

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.

770

What combiners is and when you should use a combiner in a MapReduce Job?

579

Why comparison of types is important for MapReduce?

914

what is WebDAV in Hadoop?

678

Detail description of the Reducer phases?

809

Clarify what is shuffling in map reduce?

595

What is a Distributed Cache in Hadoop?

608

How to set the number of mappers for a MapReduce job?

651

How to optimize MapReduce Job?

617

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

595

How many Mappers run for a MapReduce job in Hadoop?

570

In Hadoop what is InputSplit?

589

What is the use of InputFormat in MapReduce process?

615

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

642

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

607

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