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

Hadoop General Interview Questions

Questions Answers Views Company eMail

Give me the examples of Columnar database ?

528

What are 'slaves' and 'masters' in Hadoop?

380

What is Fault Tolerance?

496

What is the basic difference between traditional RDBMS and Hadoop?

407

What are the common types of NOSQL data bases ?

415

Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?

398

How does speculative execution work in Hadoop?

400

What is Federation?

386

What is the difference between TextInputFormat and KeyValueInputFormat class?

457

What is High Availability feature in Hadoop2?

406

What is the command to change the replication factor ?

452

What is JobTracker?

402

How many datanodes can run on a single Hadoop cluster?

407

What are some typical functions of Job Tracker?

401

What is TaskTracker?

448

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Un-Answered Questions { Hadoop General }

What is hadoop? Name the main components of a hadoop application?

409

Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

403

What is streaming in Hadoop?

394

What are the side effects of not running a secondary name node?

416

Explain how can we check whether namenode is working or not?

528

Define a record reader?

365

What is the non dfs used?

510

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

492

What are the four basic parameters of a mapper?

523

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?

416

What is the default replication factor and how will you change it?

485

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

492

What does secondary name-node means?

388

Explain what is webdav in hadoop?

476

Explain what is sequencefileinputformat?

411

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