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?

472

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

507

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?

483

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

490

Can we deploye job tracker other than name node?

692

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

503

Name the most common input formats defined in hadoop?

478

Which one is default?

524

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

473

What is tasktracker in hadoop?

467

What is a combiner in hadoop?

548

Have you ever used counters in hadoop?

455

What are some typical functions of job tracker in hadoop?

474

Can you define inputsplit in hadoop?

515

What daemons run on master nodes?

516

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Un-Answered Questions { Hadoop General }

Which scala library is used for functional programming?

492

Explain what is sequencefileinputformat?

490

Mention what is distributed cache in hadoop?

471

Specify what the information segments utilized by hadoop are?

467

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

601

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

551

Why is checkpointing important in hadoop?

504

What does hadoop-metrics.properties file do?

569

Does hadoop follows the unix pattern?

471

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

445

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

482

Mention what are the three modes in which hadoop can be run?

459

Can we deploy job tracker other than name node?

717

Mention what is the data storage component used by hadoop?

482

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

525

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