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 is pseudo-distributed mode?

605

When we send a data to a node, do we allow settling in time, before sending another data to that node?

487

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

499

Are job tracker and task trackers present in separate machines?

462

What is namenode?

482

what if job tracker machine is down?

475

What are the four basic parameters of a mapper?

567

In which location name node sores its metadata and why?

672

What are input format, input split & record reader and what they do?

623

How namenode handles data node failures?

524

What is the non dfs used?

554

How can one write custom record reader?

486

Whats the default port that jobtrackers listens ?

479

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

443

Is nosql follow relational db model?

467

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Un-Answered Questions { Hadoop General }

Explain the common input formats in hadoop?

466

Explain Hadoop streaming?

477

Ideally what should be the block size in hadoop?

461

What is 'jps'?

422

What is Erasure Coding in Hadoop?

507

What a task tracker is in hadoop?

435

What are the features of Standalone (local) mode?

596

How does speculative execution work in Hadoop?

435

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

449

What are the four basic parameters of a mapper?

567

If DataNode increases, then do we need to upgrade NameNode?

550

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

547

How to use combiner in hadoop ?

445

Explain map-only job?

527

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?

665

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