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 /?

495

In which directory hadoop is installed?

449

Does hadoop follows the unix pattern?

471

What is the hadoop-core configuration?

493

When and how to create hadoop archive?

485

What is the difference between namenode and datanode in hadoop?

536

Ideally what should be the replication factor in hadoop?

478

What is rack awareness in hadoop?

522

While starting hadoop services, datanode service is not running?

482

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

639

Why slaves limited to 4000 in hadoop version 1?

533

What is heartbeat in hadoop?

456

Explain small file problem in hadoop

456

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

601

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

482

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Un-Answered Questions { Hadoop General }

What is the difference between TextInputFormat and KeyValueInputFormat class?

540

Compare Apache Hadoop and Apache Spark?

474

How can one check whether NameNode is working or not?

581

What the information segments utilized by hadoop are?

448

While starting hadoop services, datanode service is not running?

482

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

473

If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

714

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

528

is there a standard procedure to deploy hadoop?

457

List out the some common problems faced by data analyst?

460

Give me the examples of Columnar database ?

623

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

568

What is Slot in Hadoop v1? Why was it removed from Hadoop v2?

548

What is the role of the namenode?

493

What is partitioning?

500

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