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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2370

What are the functions of NameNode?

1 1607

How to configure hadoop to reuse JVM for mappers?

916

How to resolve IOException: Cannot create directory

790

How to change replication factor of files already stored in HDFS?

824

Which one is default InputFormat in Hadoop ?

1 1905

shouldn't DFS be able to handle large volumes of data already?

878

what is a datanode?

742

How does NameNode tackle DataNode failures?

973

What is InputSplit and RecordReader?

746

What is the purpose of dfsadmin tool?

1039

How can you connect an application

836

how is a file of the size 1 GB uncompressed

687

Is map like a pointer?

765

What is the default replication factor?

787

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Un-Answered Questions { Apache Hadoop }

What is the function of NodeManager?

755

How can one increase replication factor to a desired value in Hadoop?

903

Virtual Box & Ubuntu Installation?

738

Is hadoop required for data science?

506

What is inputformat in hadoop?

553

Explain why the name ‘hadoop’?

506

How to change Replication Factor For below cases ?

809

How would you tackle counting words in several text documents?

859

What is Partioner in hadoop? Where does it run

751

How to configure hadoop to reuse JVM for mappers?

916

What is Hadoop streaming?

849

Is it possible to provide multiple inputs to hadoop? If yes, explain.

512

Explain the basic difference between traditional rdbms and hadoop?

492

What Mapper does?

796

What are the two main parts of the hadoop framework?

471

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