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 2684

What are the functions of NameNode?

1 1908

How to configure hadoop to reuse JVM for mappers?

1163

How to resolve IOException: Cannot create directory

970

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

959

Which one is default InputFormat in Hadoop ?

1 2272

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

1025

what is a datanode?

885

How does NameNode tackle DataNode failures?

1109

What is InputSplit and RecordReader?

879

What is the purpose of dfsadmin tool?

1200

How can you connect an application

984

how is a file of the size 1 GB uncompressed

878

Is map like a pointer?

879

What is the default replication factor?

948

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Un-Answered Questions { Apache Hadoop }

What are the two main components of ResourceManager?

1100

Are Namenode and job tracker on the same host?

1407

Main Components of Hadoop?

726

What is a “Distributed Cache” in Apache Hadoop?

725

Command to format the NameNode?

891

How can we look for the namenode in the browser?

676

What is a checkpoint?

923

What is Apache Hadoop?

804

What does /var/hadoop/pids do?

1218

What do shuffling do?

625

What is yarn in hadoop?

638

Explain the use of .mecia class?

742

What are combiners and its purpose?

883

What is the function of ApplicationMaster?

911

How does a namenode handle the failure of the data nodes?

644

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