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

MapReduce Interview Questions

Questions Answers Views Company eMail

What is identity mapper and reducer? In which cases can we use them?

968

Is YARN a replacement of Hadoop MapReduce?

1 1946

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

1177

What is the Hadoop MapReduce API contract for a key and value Class?

1247

Explain the Reducer's Sort phase?

842

What can be optimum value for Reducer?

904

When is the reducers are started in a MapReduce job?

828

What is the input type/format in MapReduce by default?

1042

What is the default value of map and reduce max attempts?

895

What is the Reducer used for?

889

What comes in Hadoop 2.0 and MapReduce V2 YARN

963

Why comparison of types is important for MapReduce?

916

What is the InputSplit in map reduce ?

990

what are the basic parameters of a Mapper?

778

What is a MapReduce Combiner?

750

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Un-Answered Questions { MapReduce }

what job does the conf class do?

747

In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

603

What is the role of recordreader in hadoop mapreduce?

700

What is SequenceFileInputFormat in Hadoop MapReduce?

591

What do you understand by compute and storage nodes?

648

What is RecordReader in a Map Reduce?

609

How does fault tolerance work in mapreduce?

582

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

666

What is KeyValueTextInputFormat in Hadoop MapReduce?

767

What is the role of a MapReduce partitioner?

773

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

691

Write a short note on the disadvantages of mapreduce

563

What is shuffling and sorting in mapreduce?

606

Explain the Reducer's Sort phase?

842

When should you use a reducer?

590

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