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Learning YARN

You're reading from  Learning YARN

Product type Book
Published in Aug 2015
Publisher
ISBN-13 9781784393960
Pages 278 pages
Edition 1st Edition
Languages
Concepts

Table of Contents (20) Chapters

Learning YARN
Credits
About the Authors
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Starting with YARN Basics 2. Setting up a Hadoop-YARN Cluster 3. Administering a Hadoop-YARN Cluster 4. Executing Applications Using YARN 5. Understanding YARN Life Cycle Management 6. Migrating from MRv1 to MRv2 7. Writing Your Own YARN Applications 8. Dive Deep into YARN Components 9. Exploring YARN REST Services 10. Scheduling YARN Applications 11. Enabling Security in YARN 12. Real-time Data Analytics Using YARN Index

Understanding ResourceManager's High Availability

The ResourceManager is a per-cluster service in a YARN cluster. It manages the cluster resources and schedules the applications on the basis of resource availability. What if this one service goes down or the node running the services gets out of the network? The whole cluster would become unusable, as the only point of contact for the clients is unavailable. Also, the running applications would not be able to acquire the cluster resources for task execution or status updates.

The ResourceManager service is considered to be the single point of failure in a cluster. In Hadoop 2.4.1, this issue is resolved and the High Availability feature of the ResourceManager service is introduced in YARN.

Architecture

A cluster configured with High Availability of ResourceManager has multiple ResourceManager services running; only one of them is active at a time and the rest are in standby state. Clients always connect to the active ResourceManager service...

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