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

Hadoop General Interview Questions

Questions Answers Views Company eMail

What happen if one of the datanodes has much slower cpu?

431

After increasing the replication level, I still see that data is under replicated. What could be wrong?

459

Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

445

What is the difference between a hadoop database and relational database?

453

Can we deploye job tracker other than name node?

659

What is difference between secondary namenode, checkpoint namenode & backupnode?

468

Name the most common input formats defined in hadoop?

443

Which one is default?

484

Is it possible to have hadoop job output in multiple directories?

444

What is tasktracker in hadoop?

429

What is a combiner in hadoop?

510

Have you ever used counters in hadoop?

421

What are some typical functions of job tracker in hadoop?

418

Can you define inputsplit in hadoop?

468

What daemons run on master nodes?

485

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Un-Answered Questions { Hadoop General }

Name the most common Input Formats defined in Hadoop? Which one is default?

464

Explain the Single point of Failure in Hadoop?

477

What is Small File Problem in Hadoop? How can it be resolved?

538

Can we use windows for hadoop?

477

What is structured and unstructured data?

446

Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?

430

Why use hadoop?

436

What is hadoop? Name the main components of a hadoop application?

445

Explain in which directory hadoop is installed?

469

What does hadoop-env.sh do?

446

Clarify what webdav is in hadoop?

471

What is Balancer in Hadoop?

472

What is the role of the namenode?

451

What does hadoop-metrics.properties file do?

529

What is the problem with small files in Hadoop?

526

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