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?

641

What is the difference between Hadoop and RDBMS?

597

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

638

Illustrate a simple example of the working of MapReduce.

587

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

621

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

662

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

634

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

593

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

660

how Hadoop is different from other data processing tools?

621

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

573

what is a sequence file in Hadoop?

647

What are the key differences between Pig vs MapReduce?

571

When is it not recommended to use MapReduce paradigm for large

587

what happens in textinformat ?

632

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Un-Answered Questions { MapReduce }

Difference between mapreduce and spark

657

Why MapReduce uses the key-value pair to process the data?

599

How many Reducers run for a MapReduce job in Hadoop?

564

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

617

What is optimal size of a file for distributed cache?

600

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

621

how Hadoop is different from other data processing tools?

621

Is it possible to search for files using wildcards?

609

What is partitioning in MapReduce?

678

Explain how mapreduce works.

580

MapReduce Types and Formats and Setting up a Hadoop Cluster?

886

What is Shuffling and Sorting in a MapReduce?

641

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1186

What is the difference between Hadoop and RDBMS?

597

Define Writable data types in Hadoop MapReduce?

617

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