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

Hadoop General Interview Questions

Questions Answers Views Company eMail

If datanodes increase, then do we need to upgrade namenode?

464

Which object can be used to get the progress of a particular job

472

Give me examples of unstructured data?

479

Explain the core methods of the reducer?

511

How to handle bad records during parsing?

453

What is the use of context object?

466

What happens if number of reducers are 0?

470

What are the primary phases of the reducer?

459

what is next step after mapper or maptask?

428

What is a rack?

419

Do we require two servers for the namenode and the datanodes?

527

We have already sql then why nosql?

422

What is difference between reducer and combiner?

564

What do you understand by standalone (or local) mode?

428

What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?

434

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Un-Answered Questions { Hadoop General }

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

624

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

448

What do you mean by the NameNode High Availability in hadoop?

495

What is rack awareness in hadoop?

487

What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

528

What does jps command do in Hadoop?

652

Clarify what is sqoop in hadoop?

419

List out some common problems faced by data analyst?

451

Can hadoop handle streaming data?

462

What is the best practice to deploy the secondary name node?

454

Give me examples of unstructured data?

479

How to do ‘map’ and ‘reduce’ works?

572

What is the difference between namenode and datanode in hadoop?

495

What happens if number of reducers are 0?

470

Explain is it possible to search for files using wildcards?

478

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