Topic :: Apache Hadoop





Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Why is Data Block size set to 128 MB in Hadoop?

 281

What is a Heartbeat in Hadoop?

 350

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

 319

What is a Backup node in Hadoop?

 316

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

 303

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

 347

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

 1087

What is Balancer in Hadoop?

 264

What is active and passive NameNode in Hadoop?

 297

How NameNode tackle Datanode failures in Hadoop?

 279

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

 284

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

 285

What is Mapper in Hadoop?

 307

What is Reducer in Hadoop?

 311

What are the most common InputFormats in Hadoop?

 364



Related Topics


Un-Answered Questions { Apache Hadoop }

What is Apache Hadoop YARN?

1239

What are the modules that constitute the Apache Hadoop 2.0 framework?

766

What is Apache Hadoop? Why is Hadoop essential for every Big Data application?

613

What are the core components of Apache Hadoop?

476

What is the difference between Apache Hadoop and RDBMS?

503




How is security achieved in Apache Hadoop?

511

What is Apache Hadoop?

583

What is a “Distributed Cache” in Apache Hadoop?

488

What is the problem with small files in Apache Hadoop?

509

What is Rack Awareness in Apache Hadoop?

509

Explain Erasure Coding in Apache Hadoop?

474

What is Disk Balancer in Apache Hadoop?

506

What is a speculative execution in Apache Hadoop MapReduce?

504

What are the modes in which Apache Hadoop run?

510

What is Safemode in Apache Hadoop?

459