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 2777

What are the functions of NameNode?

1 1990

How to configure hadoop to reuse JVM for mappers?

1202

How to resolve IOException: Cannot create directory

1024

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

1006

Which one is default InputFormat in Hadoop ?

1 2353

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

1067

what is a datanode?

930

How does NameNode tackle DataNode failures?

1180

What is InputSplit and RecordReader?

965

What is the purpose of dfsadmin tool?

1248

How can you connect an application

1029

how is a file of the size 1 GB uncompressed

933

Is map like a pointer?

922

What is the default replication factor?

993

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Un-Answered Questions { Apache Hadoop }

What is rack-aware replica placement policy?

1027

What are the modules that constitute the Apache Hadoop 2.0 framework?

1006

Did you ever ran into a lop sided job that resulted in out of memory error

1229

How can we check whether namenode is working or not?

659

What is the communication channel between client and namenode/datanode?

1734

Explain why the name ‘hadoop’?

712

On what basis data will be stored on a rack?

1143

Who is a 'user' in HDFS?

892

What are the main components of a Hadoop Application?

1039

what should be the ideal replication factor in hadoop?

653

What Mapper does?

990

What is HDFS ? How it is different from traditional file systems?

919

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

1173

How Mapper is instantiated in a running job?

995

What is Derby database?

907

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