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

MapReduce Interview Questions

Questions Answers Views Company eMail

Define the purpose of the partition function in mapreduce framework

663

What are the various input and output types supported by mapreduce?

630

Explain task granularity

652

Explain the general mapreduce algorithm

651

What is mapper in map reduce?

641

What happens if the quantity of the reducer is 0 in mapreduce?

594

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

593

Clarify what is shuffling in map reduce?

634

What are the fundamental configurations parameters specified in map reduce?

635

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

604

What are the four essential parameters of a mapper?

653

Mention what is the hadoop mapreduce apis contract for a key and value class?

686

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

615

What is the function of mapreduce partitioner?

639

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

598

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Un-Answered Questions { MapReduce }

How many times combiner is called on a mapper node in Hadoop?

643

Does Partitioner run in its own JVM or shares with another process?

706

In mapreduce what is a scarce system resource? Explain?

669

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

595

What is a RecordReader in Hadoop MapReduce?

676

how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

784

What is difference between a MapReduce InputSplit and HDFS block

676

What is the difference between Reducer and Combiner in Hadoop MapReduce?

677

Developing a MapReduce Application?

971

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

652

What happens when a datanode fails ?

778

How much space will the split occupy in Mapreduce?

672

what is "map" and what is "reducer" in Hadoop?

635

Mention Hadoop core components?

657

When is it not recommended to use MapReduce paradigm for large scale data processing?

655

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