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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

What is a 'block' in HDFS?

423

What is Derby database?

367

How many Daemon processes run on a Hadoop system?

584

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

409

How the Client communicates with HDFS?

462

What is NoSQL?

378

What is Row Key?

381

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

369

What is IdentityMapper?

387

Why do we use Hadoop?

377

what is the typical block size of an HDFS block?

388

What is Hadoop Custom partitioner ?

459

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

628

What stored in HDFS?

340

What is crontab? Explain with suitable example?

418


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Un-Answered Questions { Apache Hadoop }

What is NoSQL?

378


What does job conf class do?

118


Give the use of the bootstrap panel.

132


What is a “Distributed Cache” in Apache Hadoop?

169


Which files are used by the startup and shutdown commands?

159






What happens in a textinputformat?

121


What is unstructured data?

127


Define streaming?

114


What is Partioner in hadoop? Where does it run

372


In which location Name Node stores its Metadata and why?

752


Name some companies that use Hadoop?

412


What are the most commonly defined input formats in Hadoop?

496


What is Apache Hadoop?

203


What is the purpose of dfsadmin tool?

648


What alternate way does HDFS provides to recover data in case a Namenode

409