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Hadoop General Interview Questions
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Ideally what should be the block size in hadoop?

 245

What happen when namenode enters in safemode in hadoop?

 230

What is partitioning?

 254

Can we change the file cached by distributed cache

 231

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

 254

Why we use intwritable instead of int? Why we use longwritable instead of long?

 228

What happens if you don?t override the mapper methods and keep them as it is?

 243

What are the side data distribution techniques?

 263

Can we deploy job tracker other than name node?

 328

Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

 237

How many maps are there in a particular job?

 254

Can I set the number of reducers to zero?

 225

Doesn’t google have its very own version of dfs?

 248

What are the restriction to the key and value class ?

 233

If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

 417

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Un-Answered Questions { Hadoop General }

What is a commodity hardware? Does commodity hardware include RAM?

267

What are the tools used in big data?

222

Is it possible to have hadoop job output in multiple directories? If yes, how?

242

What is Mapper in Hadoop?

251

What are the side data distribution techniques?

263




Mention what is the data storage component used by hadoop?

232

List some use cases where classification machine learning algorithms can be used.

234

Why does one remove or add nodes in a Hadoop cluster frequently?

421

What mode(s) can hadoop code be run in?

248

Specify what the information segments utilized by hadoop are?

236

What is job tracker in Hadoop?

257

Is there another way to check whether Namenode is working?

234

Can we change the file cached by distributed cache

231

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

254

What is the procedure for namenode recovery?

235

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