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 are the different commands used to startup and shutdown Hadoop daemons?

583

What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

578

How is the splitting of file invoked in Hadoop framework?

562

Is it possible to provide multiple input to Hadoop? If yes then how?

542

Is it possible to have hadoop job output in multiple directories? If yes, how?

489

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

576

Explain Hadoop Archives?

581

Explain the Single point of Failure in Hadoop?

509

Explain Erasure Coding in Hadoop?

541

What is Disk Balancer in Hadoop?

564

How would you check whether your NameNode is working or not?

445

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

504

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

583

What happens if the number of reducers is 0 in Hadoop?

511

Why is Data Block size set to 128 MB in Hadoop?

469

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Un-Answered Questions { Hadoop General }

Can you explain sequence file in hadoop?

447

Do we need to place 2nd and 3rd data in rack 2 only?

485

How would you check whether your NameNode is working or not?

445

How is the splitting of file invoked in Hadoop framework?

562

When should be hadoop archive create?

460

What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?

494

How NameNode tackle Datanode failures in Hadoop?

510

What is Balancer in Hadoop?

522

What is Identity reducer?

566

What is Chain Mapper?

600

What is partitioning?

500

Explain how Hadoop cluster hardware planning and provisioning is done?

595

What do you think about the speculative execution?

479

what happens when namenode goes down during file read operation in hadoop?

639

Explain what is speculative execution?

458

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