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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

759

How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

766

How does an hadoop application look like or their basic components?

767

What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?

711

What are the important differences between apache and hadoop?

734

What is the difference between rdbms and hadoop?

677

Define tasktracker.

683

Is it necessary to write jobs for hadoop in the java language?

712

Which command is used for the retrieval of the status of daemons running the hadoop cluster?

748

What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?

832

Is it necessary to know java to learn hadoop?

701

Explain the use of .mecia class?

819

What is the sequencefileinputformat in hadoop?

762

What is the difference between hadoop and other data processing tools?

728

Which data storage components are used by hadoop?

697

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Un-Answered Questions { Apache Hadoop }

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

992

What is cloudera and why it is used?

835

What is the difference between Hadoop and Traditional RDBMS?

956

What are watches?

1064

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

1046

Who invented hadoop?

720

how can we change Replication Factor?

1072

What is NoSQL?

963

Do we need to give a password, even if the key is added in ssh?

766

What is the purpose of button groups?

804

What is HDFS block size and what did you chose in your project?

1014

How to use Apache Zookeeper command line interface?

1200

How client application interacts with the NameNode?

991

What is a Secondary Namenode? Is it a substitute to the Namenode?

1064

What is the purpose of RawComparator interface?

1173

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