Hadoop General Interview Questions
Questions Answers Views Company eMail

If datanodes increase, then do we need to upgrade namenode?

223

Which object can be used to get the progress of a particular job

230

Give me examples of unstructured data?

239

Explain the core methods of the reducer?

270

How to handle bad records during parsing?

240

What is the use of context object?

244

What happens if number of reducers are 0?

275

What are the primary phases of the reducer?

233

what is next step after mapper or maptask?

220

What is a rack?

225

Do we require two servers for the namenode and the datanodes?

260

We have already sql then why nosql?

223

What is difference between reducer and combiner?

250

What do you understand by standalone (or local) mode?

220

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

237


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Un-Answered Questions { Hadoop General }

Why slaves limited to 4000 in hadoop version 1?

251


If the hadoop administrator needs to make a change, which configuration file does he need to change?

241


Mention what are the most common input formats defined in hadoop?

239


Why is checkpointing important in hadoop?

246


Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

260






What are the hadoop configuration files at present?

233


What are configuration files in Hadoop?

221


Why Hadoop performs replication, although it results in data redundancy?

1022


Mention what job does the conf class do?

226


How Hadoop is cost-effective?

223


After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

288


How to create a user in Hadoop?

219


Is hadoop still in demand?

213


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

239


What are the core methods of a Reducer?

249