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 configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

849

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

750

What is HDFS High Availability?

823

What are different types of filesystem?

957

how can we change Replication Factor?

800

What is Apache Hadoop? Why is Hadoop essential for every Big Data application?

695

What are the core components of Apache Hadoop?

541

What is the difference between Apache Hadoop and RDBMS?

566

How is security achieved in Apache Hadoop?

620

What is Apache Hadoop?

656

What is a “Distributed Cache” in Apache Hadoop?

562

What is the problem with small files in Apache Hadoop?

568

What is Rack Awareness in Apache Hadoop?

567

Explain Erasure Coding in Apache Hadoop?

542

What is Disk Balancer in Apache Hadoop?

601

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Un-Answered Questions { Apache Hadoop }

What is HDFS - Hadoop Distributed File System?

794

What happens to a NameNode that has no data?

1394

Who is a 'user' in HDFS?

763

What are channel selectors?

776

What problems can be addressed by using Zookeeper?

805

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

777

What if rack 2 and datanode fails?

902

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

896

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

724

What is the main purpose of HDFS fsck command?

1545

What do you understand from Node redundancy and is it exist in hadoop cluster?

1073

What problems have you faced when you are working on Hadoop code?

825

Which files are used by the startup and shutdown commands?

509

What is Row Key?

794

Define tasktracker.

498

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