Hadoop General Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Hadoop General Interview Questions

Questions Answers Views Company eMail

Ideally what should be the block size in hadoop?

435

What happen when namenode enters in safemode in hadoop?

395

What is partitioning?

437

Can we change the file cached by distributed cache

398

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

456

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

445

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

431

What are the side data distribution techniques?

445

Can we deploy job tracker other than name node?

654

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

408

How many maps are there in a particular job?

430

Can I set the number of reducers to zero?

377

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

441

What are the restriction to the key and value class ?

406

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?

633

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Un-Answered Questions { Hadoop General }

In hadoop_pid_dir, what does pid stands for?

490

What sorts of actions does the job tracker process perform?

386

Specify what the information segments utilized by hadoop are?

408

What is the use of recordreader in hadoop?

394

What are the most common OutputFormat in Hadoop?

524

What daemons run on master nodes?

447

Define a udf?

382

Have you ever used counters in hadoop?

400

What is winutils hadoop?

400

Can we write map reduce program in other than java programming language. How?

462

Clarify how ordering in hdfs is finished?

442

Can we create a hadoop cluster from scratch?

401

Explain the key benefits of using storm for real time processing?

399

Give me examples of unstructured data?

455

Explain how can you check whether namenode is working beside using the jps command?

404

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