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 a Heartbeat in Hadoop?

526

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

481

What is a Backup node in Hadoop?

509

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

470

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

548

Why Hadoop performs replication, although it results in data redundancy?

1250

What is Balancer in Hadoop?

439

What is active and passive NameNode in Hadoop?

442

How can one check whether NameNode is working or not?

509

How would you restart NameNode?

395

How NameNode tackle Datanode failures in Hadoop?

442

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

402

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

426

What is meant by streaming access?

512

How to add/delete a Node to the existing cluster?

484

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Un-Answered Questions { Hadoop General }

Ideally what should be replication factor in a Hadoop cluster?

489

What is the difference between namenode and datanode in hadoop?

470

What is the difference between TextInputFormat and KeyValueInputFormat class?

465

What is rack awareness in hadoop?

459

Compare Hadoop and RDBMS?

391

Why cloudera is used?

453

What are the benefits yarn brings in to hadoop?

390

List some use cases where classification machine learning algorithms can be used.

428

Explain Data Locality in Hadoop?

520

What is a single point of failure in Hadoop 1 and how is it resolved in Hadoop 2?

549

Have you ever used counters in hadoop?

400

How to do ‘map’ and ‘reduce’ works?

520

Which are the three modes in which hadoop can be run?

429

Define “speculative execution” in hadoop?

400

How to debug Hadoop code?

494

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