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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

How Mapper is instantiated in a running job?

993

Where do you specify the Mapper Implementation?

1016

What is the meaning of speculative execution in Hadoop? Why is it important?

1057

What is the InputFormat ?

1018

Command to format the NameNode?

935

Who is a 'user' in HDFS?

890

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

1308

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

1018

What is DistributedCache and its purpose?

902

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

916

What is HDFS Block size? How is it different from traditional file system block size?

1 1452

How you can contact your client everyday ?

974

What is Input Split in hadoop?

980

What is 'Key value pair' in HDFS?

960

How to keep HDFS cluster balanced?

1097

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Un-Answered Questions { Apache Hadoop }

How is security achieved in Apache Hadoop?

909

What is Input Split in hadoop?

980

How to come out of the insert mode?

787

What are the main components of a Hadoop Application?

1039

Can Apache Kafka be used without Zookeeper?

1035

What are the functionalities of jobtracker?

672

What are the two main components of ResourceManager?

1164

What is the sequencefileinputformat in hadoop?

713

Define a job tracker?

702

What is HDFS - Hadoop Distributed File System?

962

Define streaming?

656

Explain what is the purpose of RecordReader in Hadoop?

745

In which location Name Node stores its Metadata and why?

1393

Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

640

What are the limitations of importing RDBMS tables into Hcatalog directly?

944

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