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

Hadoop General Interview Questions

Questions Answers Views Company eMail

How often DataNode send heartbeat to NameNode in Hadoop?

372

What is Mapper? How can we compress Mapper output in Hadoop?

310

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

342

What is Erasure Coding in Hadoop?

292

Why do we need Hadoop Archives? How is it created?

329

What is Slot in Hadoop v1? Why was it removed from Hadoop v2?

318

What is CAP Theorem? What aspects does Hadoop support from this theorem?

301

Why do we need Hadoop?

326

What are the core components of Hadoop?

298

What are the Features of Hadoop?

306

Compare Hadoop and RDBMS?

292

What are the modes in which Hadoop run?

314

What are the features of Standalone (local) mode?

380

What are the features of Pseudo mode?

304

What are the features of Fully-Distributed mode?

308

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Un-Answered Questions { Hadoop General }

How can you native libraries be included in yarn jobs?

313

Explain small file problem in hadoop

312

What happen if number of reducer is set to 0 in Hadoop?

324

What happens when two clients try to access the same file in the hdfs?

338

Explain Hadoop Archives?

343

What is the role of the secondary namenode?

303

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

331

Compare Hadoop 2 and Hadoop 3?

295

What a task tracker is in hadoop?

306

What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?

343

What are the features of Fully-Distributed mode?

308

What are the major differences between Hadoop 2 and Hadoop 3?

297

What happens in text format?

328

Define a sequence file in hadoop?

395

What is the difference between TextinputFormat and KeyValueTextInputFormat class?

309

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