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

Hadoop General Interview Questions

Questions Answers Views Company eMail

How often DataNode send heartbeat to NameNode in Hadoop?

508

What is Mapper? How can we compress Mapper output in Hadoop?

474

What is Rack Awareness? What is its need in Hadoop?

501

What is Erasure Coding in Hadoop?

467

Why do we need Hadoop Archives? How is it created?

524

What is Slot in Hadoop v1? Why was it removed from Hadoop v2?

478

What is CAP Theorem? What aspects does Hadoop support from this theorem?

440

Why do we need Hadoop?

496

What are the core components of Hadoop?

464

What are the Features of Hadoop?

472

Compare Hadoop and RDBMS?

391

What are the modes in which Hadoop run?

466

What are the features of Standalone (local) mode?

554

What are the features of Pseudo mode?

473

What are the features of Fully-Distributed mode?

465

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Un-Answered Questions { Hadoop General }

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

481

Clarify what a task tracker is in hadoop?

396

What is the block size in Hadoop?

384

How to do ‘map’ and ‘reduce’ works?

520

What does the file hadoop-metrics.properties do?

453

Explain what is a task tracker in hadoop?

400

What is Mapper? How can we compress Mapper output in Hadoop?

474

Mention what is data cleansing?

408

What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?

515

What is the purpose of RecordReader in hadoop?

451

Can you explain hadoop streaming?

388

Define data cleansing?

377

What is a commodity hardware? Does commodity hardware include RAM?

498

Compare Apache Hadoop and Apache Spark?

415

Explain about Hadoop file system and processing framework?

390

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