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

MapReduce Interview Questions

Questions Answers Views Company eMail

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

650

In MapReduce, ideally how many mappers should be configured on a slave?

664

What counter in Hadoop MapReduce?

643

What is SequenceFileInputFormat in Hadoop MapReduce?

627

How many Mappers run for a MapReduce job in Hadoop?

611

How many Mappers run for a MapReduce job?

609

How do Hadoop MapReduce works?

722

What is a Distributed Cache in Hadoop?

660

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

638

What is the problem with the small file in Hadoop?

651

How many Reducers run for a MapReduce job?

689

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

697

How to set the number of mappers to be created in MapReduce?

638

What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

851

What is Reducer in MapReduce?

731

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Un-Answered Questions { MapReduce }

What MapReduce framework consists of?

1094

What happen if the number of the reducer is 0 in MapReduce?

652

What is RecordReader in a Map Reduce?

644

Define Writable data types in Hadoop MapReduce?

638

Explain about the basic parameters of mapper and reducer function

1046

What are the data components used by Hadoop?

738

What main configuration parameters are specified in mapreduce?

676

What do you know about nlineinputformat?

683

What is an identity mapper and identity reducer?

604

What is a mapreduce algorithm?

637

What is the difference between Job and Task in MapReduce?

614

What is the relation between MapReduce and Hive?

643

Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

602

Explain how do ‘map’ and ‘reduce’ work?

607

Explain job scheduling through JobTracker

730

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