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 happen if one of the datanodes has much slower cpu?

389

After increasing the replication level, I still see that data is under replicated. What could be wrong?

429

Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

420

What is the difference between a hadoop database and relational database?

426

Can we deploye job tracker other than name node?

632

What is difference between secondary namenode, checkpoint namenode & backupnode?

442

Name the most common input formats defined in hadoop?

414

Which one is default?

448

Is it possible to have hadoop job output in multiple directories?

411

What is tasktracker in hadoop?

402

What is a combiner in hadoop?

486

Have you ever used counters in hadoop?

400

What are some typical functions of job tracker in hadoop?

396

Can you define inputsplit in hadoop?

432

What daemons run on master nodes?

447

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Un-Answered Questions { Hadoop General }

List of the some best tools that can be useful for data-analysis?

418

How ordering in hdfs is finished?

400

Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

415

What are the important features of hadoop?

412

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

428

What is the block size in Hadoop?

384

Give me examples of unstructured data?

455

What is a Heartbeat in Hadoop?

526

What are the main components of hadoop?

402

What is NameNode? How NameNode tackle Datanode failures in Hadoop?

445

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

431

Which scala library is used for functional programming?

417

Can I set the number of reducers to zero?

377

Explain the key benefits of using storm for real time processing?

399

List Hadoop’s three configuration files?

395

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