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?

612

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

789

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

677

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

597

What is Distributed Cache in the MapReduce Framework?

590

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

654

Is reduce-only job possible in Hadoop MapReduce?

664

How to optimize MapReduce Job?

626

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

612

In MapReduce Data Flow, when Combiner is called?

613

Differentiate Reducer and Combiner in Hadoop MapReduce?

642

What is the key- value pair in MapReduce?

736

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

611

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

612

What is the need of MapReduce in Hadoop?

605

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Un-Answered Questions { MapReduce }

What is a Speculative Execution in Hadoop MapReduce?

631

Define speculative execution?

687

What is the role of a MapReduce partitioner?

781

Explain Working of MapReduce?

930

How do ‘map’ and ‘reduce’ work?

615

What MapReduce framework consists of?

1067

What do sorting and shuffling do?

652

When is it not recommended to use MapReduce paradigm for large

587

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

789

What are the main components of MapReduce Job?

649

What is the utility of using Writable Comparable Custom Class in Map Reduce code?

955

how indexing in HDFS is done?

823

It can be possible that a Job has 0 reducers?

938

What is Data Locality in Hadoop?

624

Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

585

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