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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

What is a 'block' in HDFS?

584

What is Derby database?

523

How many Daemon processes run on a Hadoop system?

732

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

578

How the Client communicates with HDFS?

619

What is NoSQL?

531

What is Row Key?

543

What is a Task instance in Hadoop? Where does it run?1

522

What is IdentityMapper?

533

Why do we use Hadoop?

529

what is the typical block size of an HDFS block?

552

What is Hadoop Custom partitioner ?

624

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

790

What stored in HDFS?

507

What is crontab? Explain with suitable example?

569


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Un-Answered Questions { Apache Hadoop }

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

822


What is HDFS Federation?

554


How is security achieved in Apache Hadoop?

322


How many Daemon processes run on a Hadoop system?

732


What happens to a namenode, when job tracker is down?

288






What is the difference between Apache Hadoop and RDBMS?

345


Where do you specify the Mapper Implementation?

534


What is the jobtracker and what it performs in a hadoop cluster?

283


What is a Record Reader in hadoop?

562


If a data Node is full how it's identified?

535


Explain what is sqoop in Hadoop ?

321


Explain the master class and the output class do?

269


What do masters consist of?

304


What are the steps to submit a Hadoop job?

500


How many instances of tasktracker run on a hadoop cluster?

298