Which operating system(s) are supported for production hadoop deployment?

463

What are some of the characteristics of Hadoop framework?

486

Which modes can Hadoop be run in? List a few features for each mode?

502

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

489

What are the side data distribution techniques?

525

Define “speculative execution” in hadoop?

472

What is difference between reducer and combiner?

609

What are the side effects of not running a secondary name node?

483

What is the difference between an inputsplit and a block?

674

Which directory does hadoop install to?

518

What are the most common OutputFormat in Hadoop?

576

What happen when namenode enters in safemode in hadoop?

468

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?

490

What is Slot in Hadoop v1? Why was it removed from Hadoop v2?

548

What is the logistic regression?

475