Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Define streaming?

487

What is keyvaluetextinputformat?

533

Define a commodity hardware? Does commodity hardware include ram?

566

Explain the hadoop configuration files at present?

462

Explain the difference between gen1 and gen2 hadoop with regards to the namenode?

521

Explain why the name ‘hadoop’?

498

Define a combiner?

464

Explain the master class and the output class do?

465

Explain the features of stand alone (local) mode?

457

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

500

What is structured data?

479

Define streaming access?

480

Define fault tolerance?

484

What do sorting do?

487

What is nlineoutputformat?

509


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Un-Answered Questions { Apache Hadoop }

Why the name ‘hadoop’?

463


Is hadoop a database?

516


How to enable trash/recycle bin in hadoop?

512


Explain the benefits of block transfer?

627


What is the process to change the files at arbitrary locations in HDFS?

1223






How to configure hadoop to reuse JVM for mappers?

906


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

496


Can you tell us more about ssh?

531


What platform and java version are required to run hadoop?

488


What are different hdfs dfs shell commands to perform copy operation?

890


What does the command mapred.job.tracker do?

530


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

870


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

526


How many instances of a jobtracker run on hadoop cluster?

473


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

665