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 is Mapper in Hadoop?

341

What is Reducer in Hadoop?

346

What are the most common InputFormats in Hadoop?

396

Explain InputSplit in Hadoop?

314

What is the purpose of RecordReader in hadoop?

329

What is Combiner in Hadoop?

349

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

311

Why aggregation cannot be done in Mapper?

371

Explain map-only job?

347

What is KeyValueTextInputFormat in Hadoop?

339

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

330

What is TextInputFormat in Hadoop?

313

What is purpose of RecordWriter in Hadoop?

359

What are the most common OutputFormat in Hadoop?

391

What is LazyOutputFormat in Hadoop?

342

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Un-Answered Questions { Hadoop General }

How does speculative execution work in Hadoop?

306

How often do you need to reformat the namenode?

373

Give me examples of unstructured data?

314

How to do ‘map’ and ‘reduce’ works?

338

Explain the key benefits of using storm for real time processing?

298

Can I set the number of reducers to zero?

298

Explain what is hadoop?

319

What are the limitations of Hadoop?

321

When should be hadoop archive create?

316

Compare Hadoop 2 and Hadoop 3?

295

What are configuration files in Hadoop?

308

How to add/delete a Node to the existing cluster?

326

Explain what is a task tracker in hadoop?

281

Explain what is speculative execution?

285

What jobtracker is in hadoop? What are the activities followed by hadoop?

311

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