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Hadoop General Interview Questions
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What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?

 245

In which directory hadoop is installed?

 233

Does hadoop follows the unix pattern?

 227

What is the hadoop-core configuration?

 262

When and how to create hadoop archive?

 236

What is the difference between namenode and datanode in hadoop?

 258

Ideally what should be the replication factor in hadoop?

 250

What is rack awareness in hadoop?

 293

While starting hadoop services, datanode service is not running?

 242

what happens when namenode goes down during file read operation in hadoop?

 322

Why slaves limited to 4000 in hadoop version 1?

 263

What is heartbeat in hadoop?

 238

Explain small file problem in hadoop

 248

How to create the directory when name node is in safe mode?

 273

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

 248

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Un-Answered Questions { Hadoop General }

What happen when namenode enters in safemode in hadoop?

232

Compare Hadoop and RDBMS?

235

How does job tracker schedule a job for the task tracker?

273

What is Small File Problem in Hadoop? How can it be resolved?

244

What are some typical functions of job tracker in hadoop?

243




What is job tracker role in hadoop?

247

What is the role of the secondary namenode?

239

What are the port numbers of job tracker?

286

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

266

When should be hadoop archive create?

248

In which directory hadoop is installed?

233

Mention what is the data storage component used by hadoop?

234

How Big is ‘Big Data’?

240

What is TextInputFormat in Hadoop?

235

How NameNode tackle Datanode failures in Hadoop?

238

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