Hadoop General Interview Questions
Questions Answers Views Company eMail

What is Mapper in Hadoop?

253

What is Reducer in Hadoop?

252

What are the most common InputFormats in Hadoop?

300

Explain InputSplit in Hadoop?

239

What is the purpose of RecordReader in hadoop?

234

What is Combiner in Hadoop?

257

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

242

Why aggregation cannot be done in Mapper?

304

Explain map-only job?

278

What is KeyValueTextInputFormat in Hadoop?

266

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

245

What is TextInputFormat in Hadoop?

235

What is purpose of RecordWriter in Hadoop?

287

What are the most common OutputFormat in Hadoop?

304

What is LazyOutputFormat in Hadoop?

270


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Un-Answered Questions { Hadoop General }

What is the relationship between Jobs and Tasks in Hadoop?

420


For using hadoop list the network requirements?

221


Which scala library is used for functional programming?

256


What sorts of actions does the job tracker process perform?

244


Can you explain record reader?

240






Explain Data Locality in Hadoop?

248


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

256


What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?

295


What is KeyValueTextInputFormat in Hadoop?

266


Which port does SSH work on?

239


What is rack awareness in hadoop?

293


What are the parameters of mappers and reducers?

229


What does rack awareness algorithm means?

254


Why would nosql be better than using a sql database? And how much better is it?

258


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

284