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 2768

What are the functions of NameNode?

1 1989

How to configure hadoop to reuse JVM for mappers?

1201

How to resolve IOException: Cannot create directory

1013

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

1003

Which one is default InputFormat in Hadoop ?

1 2343

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

1066

what is a datanode?

923

How does NameNode tackle DataNode failures?

1167

What is InputSplit and RecordReader?

957

What is the purpose of dfsadmin tool?

1245

How can you connect an application

1028

how is a file of the size 1 GB uncompressed

929

Is map like a pointer?

917

What is the default replication factor?

988

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Un-Answered Questions { Apache Hadoop }

What is IdentityMapper?

1004

What do you mean by taskinstance?

745

What is Schema on Read and Schema on Write?

916

What is Partioner in hadoop? Where does it run

974

What is the meaning of the term "non-DFS used" in Hadoop web-console?

1308

What is version-id mismatch error in hadoop?

1055

What is DistributedCache and its purpose?

902

Define a namenode?

661

What happens to job tracker when namenode is down?

668

How to restart Namenode?

747

How a task is scheduled by a jobtracker?

674

Explain what if rack 2 and datanode fails?

636

What are the main components of a Hadoop Application?

1038

What is high availability in hadoop?

674

What are combiners and its purpose?

931

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