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

Hadoop General Interview Questions

Questions Answers Views Company eMail

If datanodes increase, then do we need to upgrade namenode?

423

Which object can be used to get the progress of a particular job

441

Give me examples of unstructured data?

445

Explain the core methods of the reducer?

474

How to handle bad records during parsing?

426

What is the use of context object?

434

What happens if number of reducers are 0?

435

What are the primary phases of the reducer?

426

what is next step after mapper or maptask?

386

What is a rack?

381

Do we require two servers for the namenode and the datanodes?

487

We have already sql then why nosql?

387

What is difference between reducer and combiner?

519

What do you understand by standalone (or local) mode?

388

What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?

405

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Un-Answered Questions { Hadoop General }

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

386

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

577

While starting hadoop services, datanode service is not running?

405

Explain small file problem in hadoop

394

Can we create a hadoop cluster from scratch?

395

Compare Apache Hadoop and Apache Spark?

404

What are the differences between hadoop 1 and hadoop 2?

394

Where are hadoop’s configuration files located and list them?

411

What is the job tracker role in hadoop?

388

What happens if the number of reducers is 0 in Hadoop?

457

What is Small File Problem in Hadoop? How can it be resolved?

490

How job tracker schedules an assignment?

374

Is it possible to rename the output file, and if so, how?

427

What is High Availability feature in Hadoop2?

405

Can you explain combiner?

402

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