HDFS


Top 50+ HDFS Interview Questions and Answers 1

Objective Hadoop distributed file system (HDFS) is a system that stores very large dataset. As it is the most important component of Hadoop Architecture so it is the most important topic for an interview. In this blog, we provide the 50+ HDFS interview questions and answers that are being framed by our company expert who provides training in Hadoop and another Bigdata framework. A Proper care has been taken while answering these questions. So we can provide you the best […]


Top 50+ HDFS Interview Questions and Answers

Objective These 50+ Hadoop HDFS Interview Questions and Answers are from different components of HDFS. If you want to become a Hadoop Admin or Hadoop developer, then DataFlair is an appropriate place. We were fully alert while framing these questions. Do comment your thoughts in comment section below. Frequently Asked HDFS Interview Questions And Answers 1) What is Hadoop HDFS – Hadoop Distributed File System? Hadoop distributed file system-HDFS is the primary storage system of Hadoop. HDFS stores very large […]


Introduction to HDFS Federation in Hadoop

1. Objective This blog will take you through the HDFS Federation in Hadoop. In this block, we will cover the HDFS Federation Introduction, what is the motivation behind it? We will also discuss the current HDFS Architecture and its limitations which are overcome by HDFS federation, Architecture of HDFS Federation in Hadoop, Advantages of HDFS Federation in this blog in detail. 2. What is HDFS Federation? Hadoop Distributed FileSystem-HDFS is the world’s most reliable storage system. HDFS is a FileSystem […]


Hadoop HDFS Architecture, Assumptions, and Goals

1. Objective In this blog about HDFS Architecture, you can read all about Hadoop HDFS. First of all, we will discuss Introduction to HDFS next with the Assumptions and Goals of HDFS design. This block will also cover the detailed architecture of Hadoop HDFS i.e NameNode, DataNode in HDFS, Secondary node, checkpoint node, Backup Node in HDFS. HDFS features like Rack awareness, high Availability, Data Blocks, Replication Management, HDFS data read and write operations are also discussed in this HDFS tutorial. […]


HDFS Disk Balancer – Learn how to Balance Data on DataNode

1. Objective This block will provide you the detailed view of Hadoop HDFS Disk Balancer. In this tutorial, we will cover what exactly is Disk balancer in Hadoop, operations of Disk balancer in HDFS, what is the need of Intra-data node balancer in HDFS, what are the capabilities of disk balancer in HDFS? 2. Introduction to HDFS Disk Balancer HDFS provides a command line tool called Diskbalancer. It distributes data in a uniform way on all disks of a datanode. […]


HDFS NameNode High Availability in Hadoop

1. Objective In this Blog about Hadoop HDFS NameNode High Availability, you can read all about how high availability is achieved in Hadoop HDFS? This HDFS tutorial will provide you a complete introduction to HDFS Namenode, Architecture of NameNode high availability in Hadoop HDFS and its implementation. Quorum Journal Nodes and Fencing of NameNode in hadoop is also covered in this blog. 2. Introduction to HDFS NameNode Hadoop Distributed FileSystem-HDFS is the world’s most reliable storage system. HDFS is a […]


Data Blocks in Hadoop HDFS – Hadoop Distributed File System 1

1. Objective In this tutorial on data Blocks in Hadoop HDFS, we will learn what is a block in HDFS, what is default data block size in HDFS Hadoop, reason why Hadoop block size is 128 MB and various advantages of Hadoop HDFS blocks. 2. Introduction to Data Blocks in Hadoop HDFS Let us first understand what is a block in HDFS? In Hadoop, HDFS splits huge files into small chunks known as blocks. These are the smallest unit of […]

Data Blocks in Hadoop HDFS

Hadoop HDFS Rack Awareness

Rack Awareness in Hadoop HDFS – An Introductory Guide 2

1. Objective This Hadoop tutorial will help you in understanding Hadoop rack awareness concept, racks in Hadoop environment, why rack awareness is needed, replica placement policy in Hadoop via Rack awareness and advantages of implementing rack awareness in Hadoop HDFS. 2. What is Rack Awareness in Hadoop HDFS? In a large cluster of Hadoop, in order to improve the network traffic while reading/writing HDFS file, namenode chooses the datanode which is closer to the same rack or nearby rack to […]


An Introduction to HDFS Erasure Coding in Big Data Hadoop

1. Objective Hadoop HDFS Erasure coding has overcome the limitation of 3x replication schema. It provides the same level of fault-tolerance with much less storage space. Storage space is reduced to 50% in Erasure coding. This HDFS erasure coding tutorial briefs about the advantages of erasure coding in Hadoop HDFS and how it saves huge disk space. We will also discuss what is erasure coding, design decision, and architecture, internal working of erasure coding. 2. Problem with old scheme of […]

Introduction to Hadoop HDFS Erasure Coding

Hadoop HDFS Tutorial for Beginners

Hadoop HDFS Tutorial-Introduction, Architecture, Features & Operations 9

1. Objective This Hadoop HDFS Tutorial will take you through the introduction of HDFS, what are different nodes, how data is stored in HDFS, HDFS architecture, HDFS features like distributed storage, fault tolerance, high availability, reliability, block etc. We will also discuss HDFS operations i.e how to write and read data from HDFS and Rack awareness. The objective of this Hadoop HDFS tutorial is to cover all the concepts of HDFS in great details. 2. Hadoop HDFS – Introduction Hadoop […]