Book Image

Learning YARN

By : Akhil Arora, Shrey Mehrotra, Shreyank Gupta
Book Image

Learning YARN

By: Akhil Arora, Shrey Mehrotra, Shreyank Gupta

Overview of this book

Today enterprises generate huge volumes of data. In order to provide effective services and to make smarter and more intelligent decisions from these huge volumes of data, enterprises use big-data analytics. In recent years, Hadoop has been used for massive data storage and efficient distributed processing of data. The Yet Another Resource Negotiator (YARN) framework solves the design problems related to resource management faced by the Hadoop 1.x framework by providing a more scalable, efficient, flexible, and highly available resource management framework for distributed data processing. This book starts with an overview of the YARN features and explains how YARN provides a business solution for growing big data needs. You will learn to provision and manage single, as well as multi-node, Hadoop-YARN clusters in the easiest way. You will walk through the YARN administration, life cycle management, application execution, REST APIs, schedulers, security framework and so on. You will gain insights about the YARN components and features such as ResourceManager, NodeManager, ApplicationMaster, Container, Timeline Server, High Availability, Resource Localisation and so on. The book explains Hadoop-YARN commands and the configurations of components and explores topics such as High Availability, Resource Localization and Log aggregation. You will then be ready to develop your own ApplicationMaster and execute it over a Hadoop-YARN cluster. Towards the end of the book, you will learn about the security architecture and integration of YARN with big data technologies like Spark and Storm. This book promises conceptual as well as practical knowledge of resource management using YARN.
Table of Contents (20 chapters)
Learning YARN
About the Authors
About the Reviewers

How to access REST services

The preceding sections in the chapter cover the list of URIs exposed by YARN. In this section, you will learn about three different ways to fetch data from these services:

  • REST client plugins

  • Curl command

  • Java API

RESTClient plugins

You can use plugins available for different web browsers to fetch data from YARN REST services. The RESTClient plugin can be used in Firefox. To install or read more about the plugin, refer to

Following are the steps to use RESTClient in Firefox:

  1. After successful installation, open the RESTClient page in your Firefox browser. The page contains a menu section and a request section:

  2. From the menu section, add a Custom Header to the request:

  3. Enter Accept and application/json in the Name and Value fields of the header, respectively. If you need the response as XML data, then specify the value of the Accept header as application/xml:

  4. Specify request URI: In the request section, choose the...