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?

387

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

429

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?

418

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

426

Can we deploye job tracker other than name node?

626

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

440

Name the most common input formats defined in hadoop?

410

Which one is default?

439

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

409

What is tasktracker in hadoop?

400

What is a combiner in hadoop?

482

Have you ever used counters in hadoop?

398

What are some typical functions of job tracker in hadoop?

394

Can you define inputsplit in hadoop?

428

What daemons run on master nodes?

445

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Un-Answered Questions { Hadoop General }

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?

418

List some use cases where classification machine learning algorithms can be used.

426

Explain how Hadoop cluster hardware planning and provisioning is done?

507

What is a Heartbeat in Hadoop?

523

What type of data hadoop can handle ?

386

How does speculative execution work in Hadoop?

404

What is job tracker in Hadoop?

463

What is the use of cloudera?

401

How will you write a custom partitioner for a Hadoop job?

414

In which location name node sores its metadata and why?

649

Can we use windows for hadoop?

444

Can you explain logistic regression?

385

What is the difference between namenode and datanode in hadoop?

466

Can we deploy job tracker other than name node?

649

What the information segments utilized by hadoop are?

384

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