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

454

In which directory hadoop is installed?

406

Does hadoop follows the unix pattern?

427

What is the hadoop-core configuration?

463

When and how to create hadoop archive?

444

What is the difference between namenode and datanode in hadoop?

495

Ideally what should be the replication factor in hadoop?

425

What is rack awareness in hadoop?

487

While starting hadoop services, datanode service is not running?

439

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

591

Why slaves limited to 4000 in hadoop version 1?

487

What is heartbeat in hadoop?

426

Explain small file problem in hadoop

421

How to create the directory when name node is in safe mode?

547

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

449

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Un-Answered Questions { Hadoop General }

Can hadoop handle streaming data?

461

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

420

How to restart NameNode or all the daemons in Hadoop?

542

What are the main features and Characteristics of Hadoop which makes it the most popular and powerful Big Data tool?

489

How to create the directory when name node is in safe mode?

547

what is next step after mapper or maptask?

428

What is the difference between an inputsplit and a block?

630

What is 'jps'?

422

What is Mapper? How can we compress Mapper output in Hadoop?

519

List of some best tools that can be useful for data-analysis?

431

What is the job tracker role in hadoop?

426

What is a rack?

419

What is Reducer in Hadoop?

549

Why aggregation cannot be done in Mapper?

560

What is distributed copy (distcp)?

482

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