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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is Shuffling and Sorting in a MapReduce?

660

What is the difference between Hadoop and RDBMS?

632

how can you check whether Namenode is working beside using the jps command?

665

Illustrate a simple example of the working of MapReduce.

631

For a Hadoop job, how will you write a custom partitioner?

652

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

692

what is the Hadoop MapReduce APIs contract for a key and value class?

668

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

636

What is the process of changing the split size if there is limited storage space on Commodity Hardware?

709

how Hadoop is different from other data processing tools?

646

List the configuration parameters that have to be specified when running a MapReduce job.

600

what is a sequence file in Hadoop?

677

What are the key differences between Pig vs MapReduce?

611

When is it not recommended to use MapReduce paradigm for large

647

what happens in textinformat ?

667

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Un-Answered Questions { MapReduce }

What platform and Java version is required to run Hadoop?

642

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

845

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

964

How to write MapReduce Programs?

715

What is the process of changing the split size if there is limited storage space on Commodity Hardware?

709

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

604

What is mapreduce algorithm?

588

Is there any point of learning mapreduce, then?

646

Explain the Reducer's Sort phase?

884

What are advantages of Spark over MapReduce?

692

What is heartbeat in hdfs? Explain.

681

Why can aggregation not be done in Mapper in MapReduce?

609

What is Text Input Format?

675

What MapReduce framework consists of?

1094

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

939

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