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Hadoop Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

 357

What MapReduce framework consists of?

 352

Can we submit the mapreduce job from slave node?

 397



How can we control particular key should go in a specific reducer?

 228

How can you add the arbitrary key-value pairs in your mapper?

 339

What is Reduce only jobs?

 197

What is a IdentityMapper and IdentityReducer in MapReduce ?

 221

Explain Working of MapReduce?

 237

Write a Mapreduce Program for Character Count ?

 316

how to proceed to write your first mapreducer program?

 623

How to set the number of reducers?

 540

Developing a MapReduce Application?

 229

Different ways of debugging a job in MapReduce?

 381

Explain the Reducer's reduce phase?

 268

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

 1 660






Un-Answered Questions { Hadoop }

What is the MapReduce plan in pig architecture?

249

What are the components of Hive architecture?

324

Why are the number of splits equal to the number of maps?

179

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

389

How we can take Hadoop out of Safe Mode?

171




Why do we use Hadoop?

176

Name some companies that use Hadoop?

221

How the HDFS Blocks are replicated?

181

Write a Mapreduce Program for Character Count ?

316

Explain the difference between COUNT_STAR and COUNT functions in Apache Pig?

150

On what basis data will be stored on a rack?

381

What is Row Key?

189

Virtual Box & Ubuntu Installation?

172

Explain about the popular use cases of Apache Spark

80

What are watches?

204

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