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

Hadoop General Interview Questions

Questions Answers Views Company eMail

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

412

In which directory hadoop is installed?

360

Does hadoop follows the unix pattern?

387

What is the hadoop-core configuration?

434

When and how to create hadoop archive?

406

What is the difference between namenode and datanode in hadoop?

464

Ideally what should be the replication factor in hadoop?

386

What is rack awareness in hadoop?

453

While starting hadoop services, datanode service is not running?

406

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

555

Why slaves limited to 4000 in hadoop version 1?

439

What is heartbeat in hadoop?

395

Explain small file problem in hadoop

395

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

502

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

409

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Un-Answered Questions { Hadoop General }

What is meant by streaming access?

500

When and how to create hadoop archive?

406

Can you define udf?

396

How ordering in hdfs is finished?

395

What is winutils hadoop?

396

How is the splitting of file invoked in Hadoop ?

480

Explain the Single point of Failure in Hadoop?

438

What happen when namenode enters in safemode in hadoop?

391

What happen if one of the datanodes has much slower cpu?

385

What is the purpose of RecordReader in hadoop?

443

Can you explain record reader?

400

Can we create a hadoop cluster from scratch?

396

Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?

429

Clarify what is sequence file input format?

488

Can you give a detailed overview about the Big Data being generated by Facebook?

391

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