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 ?

493

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

464

What is the block size in Hadoop?

434

Can you give some examples of Big Data?

470

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

473

What is streaming in Hadoop?

436

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

515

What is streaming access?

495

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

476

Give examples of some companies that are using Hadoop structure?

440

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

469

How analysis of Big Data is useful for organizations?

460

What does the file hadoop-metrics.properties do?

486

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?

456

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

453

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Un-Answered Questions { Hadoop General }

How to create hadoop archive?

419

What is structured and unstructured data?

446

What happen on the namenode when a client tries to read a data file?

461

What is the number of default partitioner in hadoop?

441

What a task tracker is in hadoop?

435

Which operating system(s) are supported for production hadoop deployment?

428

What are input format, input split & record reader and what they do?

623

What are the Features of Hadoop?

511

Why slaves limited to 4000 in hadoop version 1?

487

Why do the nodes are removed and added frequently in a hadoop cluster?

475

If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

451

How many job tracker processes can run on a single Hadoop cluster?

474

What does rack awareness mean?

411

How to create the directory when name node is in safe mode?

547

Why is checkpointing important in hadoop?

468

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