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 2677

What are the functions of NameNode?

1 1889

How to configure hadoop to reuse JVM for mappers?

1151

How to resolve IOException: Cannot create directory

961

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

954

Which one is default InputFormat in Hadoop ?

1 2251

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

1017

what is a datanode?

878

How does NameNode tackle DataNode failures?

1105

What is InputSplit and RecordReader?

875

What is the purpose of dfsadmin tool?

1191

How can you connect an application

979

how is a file of the size 1 GB uncompressed

867

Is map like a pointer?

872

What is the default replication factor?

942

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Un-Answered Questions { Apache Hadoop }

What is the relation between job and task in hadoop?

588

What is inputsplit in hadoop? Explain.

722

What is partioner in hadoop? Where does it run,mapper or reducer?

622

Is hadoop based on google mapreduce?

626

What are combiners and its purpose?

877

what are the steps involved in commissioning adding

865

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

1233

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

964

Who is a 'user' in HDFS?

843

What is the function of NodeManager?

862

What is Disk Balancer in Apache Hadoop?

796

What do sorting do?

639

Explain a simple Map/Reduce problem.

669

Explain what happens in textinformat ?

704

What problems can be addressed by using Zookeeper?

899

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