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Hadoop Interview Questions
Questions Answers Views Company eMail

Explain the difference between mapreduce engine and hdfs cluster?

132

Explain the difference between an hdfs block and input split?

63

What do you know about sequencefileinputformat?

638

Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

648

Why the name ‘hadoop’?

621

What do you know about nlineoutputformat?

696

How can we change the split size if our commodity hardware has less storage space?

677

How is hadoop different from other data processing tools?

683

What happens in a textinputformat?

669

Can you explain how do ‘map’ and ‘reduce’ work?

744

Can we call vms as pseudos?

660

What do the master class and the output class do?

675

What does job conf class do?

676

What do you know about keyvaluetextinputformat?

610

Define a namenode?

666


Un-Answered Questions { Hadoop }

What is pig properties?

555


What is ObjectInspector functionality in Hive?

953


Why spark is used?

326


How does broadcast join work in spark?

304


What operations RDD support?

310


what is the traditional method of message trfer?

577


What does apache mahout do?

57


What is coalesce in spark sql?

311


What are the main components of Cassandra data models?

117


Why do we use spark?

333


What is the function of co-group in Pig?

794


Talk about the concept of tunable consistency in Cassandra.

127


What are some of the characteristics of Hadoop framework?

450


What is the function of UNION and SPLIT operators? Give examples?

539


What is ZooKeeper quorum?

5