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?

472

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 }

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

483

What are the different commands used to startup and shutdown Hadoop daemons?

527

What does secondary name-node means?

427

How to handle bad records during parsing?

452

What is throughput in Hadoop?

534

Explain what is storage and compute nodes?

512

Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

445

Can you explain edge nodes in hadoop?

437

What does the high availability of a name-node means? How is it accomplished?

415

What are the port numbers of job tracker?

525

What does block mean?

439

Have you ever used counters in hadoop?

421

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

436

What is Combiner in Hadoop?

534

Whats the default port that jobtrackers listens ?

479

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