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 a 'block' in HDFS?

805

What is Derby database?

757

How many Daemon processes run on a Hadoop system?

962

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

798

How the Client communicates with HDFS?

849

What is NoSQL?

768

What is Row Key?

793

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

724

What is IdentityMapper?

787

Why do we use Hadoop?

753

what is the typical block size of an HDFS block?

757

What is Hadoop Custom partitioner ?

854

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

1109

What stored in HDFS?

745

What is crontab? Explain with suitable example?

820

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Un-Answered Questions { Apache Hadoop }

Explain a simple Map/Reduce problem.

573

what should be the ideal replication factor in hadoop?

494

What exactly is hadoop?

541

What is Safemode in Apache Hadoop?

521

What is a checkpoint?

815

How the Client communicates with HDFS?

849

Can hive run without hadoop?

514

Why do we use Hadoop?

753

What happens to a NameNode that has no data?

1394

What does job conf class do?

496

Should we use RAID in Hadoop or not?

865

What are the stable versions of Hadoop?

827

Why password is needed in ssh localhost?

547

what are Task Tracker and Job Tracker?

838

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

895

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