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

Hadoop General Interview Questions

Questions Answers Views Company eMail

Ideally what should be the block size in hadoop?

461

What happen when namenode enters in safemode in hadoop?

429

What is partitioning?

463

Can we change the file cached by distributed cache

428

Why would nosql be better than using a sql database? And how much better is it?

484

Why we use intwritable instead of int? Why we use longwritable instead of long?

483

What happens if you don?t override the mapper methods and keep them as it is?

462

What are the side data distribution techniques?

478

Can we deploy job tracker other than name node?

677

Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

440

How many maps are there in a particular job?

458

Can I set the number of reducers to zero?

397

Doesn’t google have its very own version of dfs?

481

What are the restriction to the key and value class ?

431

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?

665

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Un-Answered Questions { Hadoop General }

What are the important features of hadoop?

442

What is Erasure Coding in Hadoop?

507

Mention what does the text input format do?

414

Can you explain record reader?

431

What is job tracker role in hadoop?

472

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

447

How would you restart NameNode?

422

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

489

Ideally what should be the block size in hadoop?

461

Who are ‘Data Scientists’?

415

How to specify more than one path for storage in Hadoop?

506

What kind of hardware is best for hadoop?

418

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

505

Why do we need Hadoop Archives? How is it created?

563

Give me an example of document database ?

476

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