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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Explain why do we need hadoop?

621

Explain the features of pseudo mode?

658

What do shuffling do?

625

Explain the basic difference between traditional rdbms and hadoop?

614

Explain what if rack 2 and datanode fails?

593

Define a job tracker?

648

Explain the features of fully distributed mode?

582

What are the characteristics of hadoop framework?

627

Explain how can we change the split size if our commodity hardware has less storage space?

598

Explain how is hadoop different from other data processing tools?

683

Define a datanode?

597

Is secondary namenode a substitute to the namenode?

633

What is a secondary namenode?

580

What is unstructured data?

608

Explain the overview of hadoop history breifly?

572

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Un-Answered Questions { Apache Hadoop }

How to come out of the insert mode?

723

Which are the three main hdfs-site.xml properties?

619

Explain the features of stand alone (local) mode?

583

What is inputformat in hadoop?

702

What is the InputFormat ?

965

What are the default configuration files that are used in hadoop?

646

What is the purpose of dfsadmin tool?

1200

What are the different methods to run Spark over Apache Hadoop?

680

Is hadoop a database?

627

Have you ever used Counters in Hadoop. Give us an example scenario?

1024

What are sink processors?

865

Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

594

What is Row Key?

944

What do the master class and the output class do?

629

What is difference between split and block in hadoop?

1351

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