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

432

Do we need to place 2nd and 3rd data in rack 2 only?

443

Clarify how ordering in hdfs is finished?

496

What is active and passive NameNode in Hadoop?

463

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

442

Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?

430

Why is Data Block size set to 128 MB in Hadoop?

439

How can native libraries be included in yarn jobs?

482

What are the main components in Hadoop Eco-System and what are their functions ?

493

Which one is default?

485

Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?

439

Mention how hadoop is different from other data processing tools?

409

When and how to create hadoop archive?

444

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

436

Explain the core methods of the reducer?

511