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Hadoop General Interview Questions
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Which port does SSH work on?

 239

Is there another way to check whether Namenode is working?

 236

What is the NameNode port number?

 225

Give me an example of document database ?

 249

What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?

 243

What are the four modules that make up the Apache Hadoop framework?

 264

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

 273

What is 'jps'?

 243

Explain about Hadoop file system and processing framework?

 245

How Hadoop is cost-effective?

 235

What does the mapred.job.tracker command do?

 244

Is it possible to rename the output file, and if so, how?

 239

What are the Hadoop features extended to its eco-system components ?

 246

What is job tracker in Hadoop?

 261

What sorts of actions does the job tracker process perform?

 244

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Un-Answered Questions { Hadoop General }

Mention what job does the conf class do?

239

What is the difference between TextInputFormat and KeyValueInputFormat class?

234

Explain what is namenode in hadoop?

241

What are the side effects of not running a secondary name node?

282

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

277




How many daemon processes run on a hadoop cluster?

238

Clarify what is sequence file input format?

273

What is tasktracker in hadoop?

236

Can you explain commodity hardware?

243

What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?

249

What are some of the characteristics of Hadoop framework?

244

In hadoop_pid_dir, what does pid stands for?

244

Explain edge nodes in hadoop?

244

When and how to create hadoop archive?

236

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

256

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