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You're reading from Mastering Hadoop 3

Product typeBook

Published inFeb 2019

Reading LevelExpert

PublisherPackt

ISBN-139781788620444

Edition1st Edition

Languages

Java

Tools

Hadoop

Concepts

Data Processing

Authors (2):

Chanchal Singh

Manish Kumar

View More author details

Points to remember

We have covered the HDFS in detail and the following are a few points to remember:

HDFS consists of two main components: NameNode and DataNode. NameNode is a master node that stores metadata information, whereas DataNodes are slave nodes that store file blocks.
Secondary NameNode is responsible for performing checkpoint operations in which edit log changes are applied to fsimage. This is also known as a checkpoint node.
Files in HDFS are split into blocks and blocks are replicated across a number of DataNodes to ensure fault tolerance. The replication factor and block size are configurable.

HDFS Balancer is used to distribute data in an equal fashion between all DataNodes. It is a good practice to run balancer whenever a new DataNode is added and schedule a job to run balancer at regular intervals.
In Hadoop 3, high availability can now have more than two NameNodes running at a time. If an active NameNode fails, a new NameNode will be elected from an other NameNode and will...

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Mastering Hadoop 3

Published in: Feb 2019Publisher: PacktISBN-13: 9781788620444

Authors (2)

Chanchal Singh

Chanchal Singh has over half decades experience in Product Development and Architect Design. He has been working very closely with leadership team of various companies including directors ,CTO's and Founding members to define technical road-map for company.He is the Founder and Speaker at meetup group Big Data and AI Pune MeetupExperience Speaks. He is Co-Author of Book Building Data Streaming Application with Apache Kafka. He has a Bachelor's degree in Information Technology from the University of Mumbai and a Master's degree in Computer Application from Amity University. He was also part of the Entrepreneur Cell in IIT Mumbai. His Linkedin Profile can be found at with the username Chanchal Singh.
Read more about Chanchal Singh

Manish Kumar

Manish Kumar works as Director of Technology and Architecture at VSquare. He has over 13 years' experience in providing technology solutions to complex business problems. He has worked extensively on web application development, IoT, big data, cloud technologies, and blockchain. Aside from this book, Manish has co-authored three books (Mastering Hadoop 3, Artificial Intelligence for Big Data, and Building Streaming Applications with Apache Kafka).
Read more about Manish Kumar

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You're reading from Mastering Hadoop 3

Points to remember

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Authors (2)

Building Data Streaming Applications with Apache Kafka

Hadoop 2.x Administration Cookbook

Apache Hadoop 3 Quick Start Guide

Mastering Apache Storm

Learning Apache Flink

Big Data Analytics with Hadoop 3

Modern Big Data Processing with Hadoop

Apache Hive Essentials

HBase High Performance Cookbook

Data Lake for Enterprises

Artificial Intelligence for Big Data

Apache Kafka 1.0 Cookbook

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