Hadoop General Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Hadoop General Interview Questions

Questions Answers Views Company eMail

Explain what is sequencefileinputformat?

457

Mention how hadoop is different from other data processing tools?

409

Mention what are the most common input formats defined in hadoop?

442

Mention what is rack awareness?

381

Mention what is the difference between an rdbms and hadoop?

424

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

419

Explain how does hadoop classpath plays a vital role in stopping or starting in hadoop daemons?

614

Explain what is storage and compute nodes?

512

Explain how jobtracker schedules a task?

465

Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?

439

What happens in text format?

436

Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

445

Explain what is a task tracker in hadoop?

452

Explain what is speculative execution?

423

Explain what happens in text format?

573

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Un-Answered Questions { Hadoop General }

Define “speculative execution” in hadoop?

424

What is the non dfs used?

554

In hadoop_pid_dir, what does pid stands for?

524

Clarify what a task tracker is in hadoop?

427

What sorts of actions does the job tracker process perform?

421

What is the difference between namenode and datanode in hadoop?

495

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

495

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

502

How analysis of Big Data is useful for organizations?

460

What are the port numbers of job tracker?

525

Why aggregation cannot be done in Mapper?

560

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

443

Clarify how job tracker schedules an assignment?

419

Can you explain textinformat?

497

Why does one remove or add nodes in a Hadoop cluster frequently?

694

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