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 Identity reducer?

566

What is Chain Mapper?

600

What are the core methods of a Reducer?

552

What are the parameters of mappers and reducers?

526

What is the difference between TextinputFormat and KeyValueTextInputFormat class?

538

How is the splitting of file invoked in Hadoop ?

569

How many InputSplits will be made by hadoop framework?

526

Explain the usage of Context Object?

517

List Hadoop’s three configuration files?

454

What is Distributed Cache in Hadoop?

499

What is the relationship between Jobs and Tasks in Hadoop?

650

Who are ‘Data Scientists’?

457

Tell me some major benefits of Hadoop?

450

What is structured and unstructured data?

495

According to IBM, what are the three characteristics of Big Data?

471

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Un-Answered Questions { Hadoop General }

In which location name node sores its metadata and why?

703

What is the procedure for namenode recovery?

489

How can one write custom record reader?

523

How to create a user in Hadoop?

527

What is the problem with small files in Hadoop?

563

Why is checkpointing important in hadoop?

503

Are job tracker and task trackers present in separate machines?

502

Compare Hadoop 2 and Hadoop 3?

456

How would you restart NameNode?

452

Ideally what should be the block size in hadoop?

491

What is the default replication factor in Hadoop and how will you change it?

639

What are configuration files in Hadoop?

554

Is there another way to check whether Namenode is working?

456

How many maps are there in a particular job?

496

What is the basic difference between traditional RDBMS and Hadoop?

477

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