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 is a Heartbeat in Hadoop?

602

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

546

What is a Backup node in Hadoop?

603

What do you mean by the NameNode High Availability in hadoop?

528

What is the default replication factor in Hadoop and how will you change it?

639

Why Hadoop performs replication, although it results in data redundancy?

1308

What is Balancer in Hadoop?

522

What is active and passive NameNode in Hadoop?

501

How can one check whether NameNode is working or not?

581

How would you restart NameNode?

452

How NameNode tackle Datanode failures in Hadoop?

510

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

475

If DataNode increases, then do we need to upgrade NameNode in Hadoop?

496

What is meant by streaming access?

589

How to add/delete a Node to the existing cluster?

566

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Un-Answered Questions { Hadoop General }

What are the restriction to the key and value class ?

463

What are the important modes of hadoop?

577

What are the functionalities of jobtracer?

458

Compare Hadoop 2 and Hadoop 3?

456

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

482

What is the key difference between NameNode and DataNode in Hadoop?

525

Which object can be used to get the progress of a particular job

515

How to debug Hadoop code?

568

what is next step after mapper or maptask?

455

What are some typical functions of job tracker in hadoop?

474

What is Rack Awareness? What is its need in Hadoop?

568

What is the use of cloudera?

483

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

495

What is throughput in Hadoop?

573

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

471

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