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 Mapper in Hadoop?

502

What is Reducer in Hadoop?

506

What are the most common InputFormats in Hadoop?

550

Explain InputSplit in Hadoop?

434

What is the purpose of RecordReader in hadoop?

442

What is Combiner in Hadoop?

495

If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

421

Why aggregation cannot be done in Mapper?

520

Explain map-only job?

489

What is KeyValueTextInputFormat in Hadoop?

482

What happen if number of reducer is set to 0 in Hadoop?

464

What is TextInputFormat in Hadoop?

473

What is purpose of RecordWriter in Hadoop?

477

What are the most common OutputFormat in Hadoop?

517

What is LazyOutputFormat in Hadoop?

459

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Un-Answered Questions { Hadoop General }

What is the hadoop-core configuration?

433

How often do you need to reformat the namenode?

476

Explain Hadoop Archives?

487

Whats the default port that jobtrackers listens ?

443

Can you explain sequence file in hadoop?

375

Explain what is a sequence file in hadoop?

424

What is a commodity hardware? Does commodity hardware include RAM?

491

What is structured and unstructured data?

413

Can we deploy job tracker other than name node?

646

Clarify what is sequence file input format?

487

What is Disk Balancer in Hadoop?

453

What are the important modes of hadoop?

495

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

407

What are the main components in Hadoop Eco-System and what are their functions ?

445

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

384

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