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

MapReduce Interview Questions

Questions Answers Views Company eMail

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

689

Explain about the partitioning, shuffle and sort phase in MapReduce?

865

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

756

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

679

What is Distributed Cache in the MapReduce Framework?

668

How to create a custom key and custom value in MapReduce Job?

722

Is reduce-only job possible in Hadoop MapReduce?

740

How to optimize MapReduce Job?

688

In MapReduce how to change the name of the output file from part-r-00000?

667

In MapReduce Data Flow, when Combiner is called?

708

Differentiate Reducer and Combiner in Hadoop MapReduce?

725

What is the key- value pair in MapReduce?

838

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

701

How to write a custom partitioner for a Hadoop MapReduce job?

693

What is the need of MapReduce in Hadoop?

676

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Un-Answered Questions { MapReduce }

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

644

What is an identity mapper and identity reducer?

660

What is streaming?

727

In Map Reduce why map write output to Local Disk instead of HDFS?

945

What is KeyValueTextInputFormat in Hadoop MapReduce?

854

What is Data Locality in Hadoop?

714

What do you understand by compute and storage nodes?

724

What is the relationship between Job and Task in Hadoop?

706

What do sorting and shuffling do?

744

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

703

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

1120

Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

641

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

1342

Explain what does the conf.setMapper Class do in MapReduce?

703

Where is Mapper output stored?

896

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