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Learning Karaf Cellar

You're reading from Learning Karaf Cellar Build and implement a complete clustering solution for the Apache Karaf OSGi container

Product type Paperback

Published in Jul 2014

Publisher

ISBN-13 9781783984602

Length 124 pages

Edition 1st Edition

Concepts

Application Development

Authors (2):

Jean Baptiste Onofre

Jean-Baptiste Onofré

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Table of Contents (11) Chapters

Preface

1. Apache Karaf – Provisioning and Clusters FREE CHAPTER

2. Apache Karaf Cellar

3. Hazelcast

4. Cluster Groups

5. Producers, Consumers, Handlers, Listeners, and Synchronizers

6. The Filtering of Cluster Events

7. DOSGi

8. Cellar and Camel

9. Roadmap

Index

Chapter 4. Cluster Groups

Until now, we have used Cellar as a global cluster. This means that all the nodes will have the same functions and roles in the cluster. However, when using a pool or farm of Karaf instances in a real live system, we may want to dedicate a subset of the instances for the given functions/roles. This is the role of the Cellar cluster groups.

For instance, we have a farm of 20 nodes in our Cellar cluster.

We may want to deploy the following:

A camel route can be described and packaged as a Karaf Features XML file. We want to deploy this route only on 10 nodes of the cluster (not on all the nodes).
A CXF web service (described and deployed as another Karaf Features XML file) on the other 10 nodes.

In Cellar, we can create different cluster groups and define a node as a member of one or more cluster groups.

The rest of the chapter is locked

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Authors (1)

Jean-Baptiste Onofré

Jean-Baptiste Onofré

Jean-Baptiste Onofré is a member of the Apache Software Foundation, and he has been involved in Apache projects for about 10 years. He's the PMC chair of Apache Karaf and its subprojects, including Cellar, Cave, and EIK. He's also a PMC member of Apache ACE, Apache ServiceMix, and Apache Syncope, and he is a committer for Apache ActiveMQ, Apache Archiva, Apache Aries, Apache Camel, and Apache jClouds. He's currently working at Talend (http://www.talend.com) as a software architect and is a member of the Talend Apache team. He has provided articles on Java technologies for GNU/Linux magazine France and has worked as an author and a reviewer on different books, such as Learning Karaf Cellar and Apache Karaf Cookbook, both by Packt Publishing. He has also given talks on Apache projects, such as Karaf and Camel, at different conferences, especially ApacheCon NA and Europe, CamelOne, and so on.

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