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 difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

678

How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

689

How does an hadoop application look like or their basic components?

653

What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?

622

What are the important differences between apache and hadoop?

662

What is the difference between rdbms and hadoop?

602

Define tasktracker.

600

Is it necessary to write jobs for hadoop in the java language?

619

Which command is used for the retrieval of the status of daemons running the hadoop cluster?

665

What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?

717

Is it necessary to know java to learn hadoop?

612

Explain the use of .mecia class?

734

What is the sequencefileinputformat in hadoop?

668

What is the difference between hadoop and other data processing tools?

632

Which data storage components are used by hadoop?

624

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Un-Answered Questions { Apache Hadoop }

What is the Use of SSH in Hadoop ?

919

How to configure hadoop to reuse JVM for mappers?

1152

What will you do when NameNode is down?

950

What are the core components of Apache Hadoop?

713

Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?

645

What is Rack awareness?

942

What does /var/hadoop/pids do?

1213

What is the jobtracker?

586

How to enable recycle bin or trash in hadoop?

648

Name the examples of some companies that are using hadoop structure?

637

How to resolve small file problem in hdfs?

924

What is difference between regular file system and HDFS?

993

Define fault tolerance?

607

Is secondary namenode a substitute to the namenode?

626

Is it necessary to know java to learn hadoop?

612

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