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

The migration steps from MRv1 to MRv2

The migration steps from MRv1 to MRv2 can be categorized as:

  • The configuration changes to use YARN as the MapReduce execution framework

  • The binary / source compatibility while working with MapReduce APIs

Configuration changes

In this section, we'll discuss the configuration changes required during migration from MRv1 to MRv2. The information provided in this section is limited to the minimum configuration changes required during the migration. Detailed information regarding the deprecated and new properties is provided in a Cloudera blog at

The upcoming sections describe the changes while migrating from MRv1 to MRv2.

  • The MapReduce framework

    If you recall the configuration of a Hadoop cluster in MRv1, the mapred-site.xml file contains the host information related to the JobTracker service. In MRv2, the following property in the mapred-site.xml...