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

445

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

433

What is the block size in Hadoop?

379

Can you give some examples of Big Data?

423

After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

438

What is streaming in Hadoop?

394

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

492

What is streaming access?

461

How can you set an arbitrary number of Reducers to be created for a job in Hadoop?

433

Give examples of some companies that are using Hadoop structure?

394

Which modes can Hadoop be run in? List a few features for each mode?

434

How analysis of Big Data is useful for organizations?

426

What does the file hadoop-metrics.properties do?

448

Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?

429

How will you write a custom partitioner for a Hadoop job?

410

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Un-Answered Questions { Hadoop General }

What is TextInputFormat in Hadoop?

474

Have you ever used counters in hadoop?

395

What is KeyValueTextInputFormat in Hadoop?

483

Who are ‘Data Scientists’?

378

What is Reducer in Hadoop?

507

What is the block size in Hadoop?

379

Explain small file problem in hadoop

395

what happens when namenode goes down during file read operation in hadoop?

555

If DataNode increases, then do we need to upgrade NameNode?

516

What are the four basic parameters of a mapper?

523

If the hadoop administrator needs to make a change, which configuration file does he need to change?

403

Is hadoop still in demand?

407

What is the difference between a hadoop database and relational database?

422

Define a sequence file in hadoop?

504

Can you explain sequence file in hadoop?

376

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