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?

513

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

515

Give me examples of unstructured data?

523

Explain the core methods of the reducer?

542

How to handle bad records during parsing?

486

What is the use of context object?

504

What happens if number of reducers are 0?

507

What are the primary phases of the reducer?

487

what is next step after mapper or maptask?

455

What is a rack?

456

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

554

We have already sql then why nosql?

467

What is difference between reducer and combiner?

609

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

473

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

471

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Un-Answered Questions { Hadoop General }

Mention what is distributed cache in hadoop?

471

While starting hadoop services, datanode service is not running?

481

What is the NameNode port number?

432

What is TaskTracker?

517

Why slaves limited to 4000 in hadoop version 1?

533

Why is checkpointing important in hadoop?

503

What is the difference between an inputsplit and a block?

674

How is the splitting of file invoked in Hadoop ?

569

How often DataNode send heartbeat to NameNode in Hadoop?

577

How job tracker schedules an assignment?

456

Explain InputSplit in Hadoop?

498

How would an hadoop administrator deploy various components of hadoop in production?

453

What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?

487

What is Federation?

457

How can you set an arbitrary number of Reducers to be created for a job in Hadoop?

505

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