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?

491

What happen when namenode enters in safemode in hadoop?

468

What is partitioning?

500

Can we change the file cached by distributed cache

466

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

518

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

527

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

509

What are the side data distribution techniques?

527

Can we deploy job tracker other than name node?

717

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

472

How many maps are there in a particular job?

496

Can I set the number of reducers to zero?

428

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

523

What are the restriction to the key and value class ?

463

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?

714

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Un-Answered Questions { Hadoop General }

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

525

Why Hadoop performs replication, although it results in data redundancy?

1309

When should be hadoop archive create?

460

What is a namenode?

429

How to debug Hadoop code?

569

Name the most common Input Formats defined in Hadoop? Which one is default?

495

What does jps command do in Hadoop?

700

What is Fault Tolerance?

566

What is Reducer in Hadoop?

594

What do you understand by unit and ()in scala?

535

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

473

How Hadoop is cost-effective?

450

What is Rack Awareness? What is its need in Hadoop?

568

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

652

What is Federation?

457

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