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

NodeManager REST APIs

YARN NodeManager APIs allow the user or administrator to obtain the node resource metrics, health status of the node, list of applications and containers associated with that node, and so on. The default port for NodeManager's web application is 8042. An administrator can configure the web application address using the yarn.nodemanager.webapp.address property in the yarn-site.xml file.

NodeManager REST APIs can be grouped as:

  • Node summary

  • Applications

  • Containers

The node summary

This API provides metadata about the node, which includes the version of the NodeManager service, host name, node status, resource utilization, and more:

  • Node metadata: The summary for the node:

    • URI: http://<NM Http Address:Port>/ws/v1/node/info

    • Example: http://node1:8042/ws/v1/node/info


Similar to the ResourceManager API, the application APIs for NodeManager provide information related to a collection of application objects or a specific application that is associated with the...