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| Developer(s) | Terracotta, Inc |
| Stable release | 3.1.1 / 2009-10-08 |
| Written in | Java |
| Operating system | Cross-platform |
| Platform | Java Virtual Machine |
| Development status | Active |
| Type | Cluster |
| License | Terracotta Public License based on MPL, with an additional requirement for attribution |
| Website | http://www.terracotta.org |
Terracotta is an open source JVM-level clustering software for Java. It delivers clustering as a runtime infrastructure service, which simplifies the task of clustering a Java application immensely, by effectively clustering the JVM underneath the application, instead of clustering the application itself [1].
Terracotta's JVM-level clustering can turn single-node, multi-threaded applications into distributed, multi-node applications, often with no code changes. Terracotta uses standard bytecode manipulation techniques to plug into the Java Memory Model in order to maintain semantics of Java (Java Language Specification), such as pass-by-reference, thread coordination, and garbage collection across the cluster. Terracotta's JVM-level clustering is enabled through declarative configuration (XML), and provides fine-grained, field-level replication, which means that objects do not need to implement Java serialization.
Terracotta uses the idea of Terracotta Integration Modules, or TIMs, to plug into common OSS, like Apache Tomcat, EHcache and Hibernate.
Typical use cases include:
- HTTP session clustering
- Distributed caching
- Hibernate caching
- Virtual heap for large data sets
- Workload distribution
- Inter-JVM coordination
- POJO clustering
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Development status
Employees of Terracotta, Inc. and independent volunteers develop and maintain Terracotta. Users have free access to the source code and to the binary form of Terracotta under the Terracotta Public License.
A development line for select features is prepared in proprietary, closed source code and maintained solely by employees of Terracotta, Inc.
Components
- Terracotta Core
The core features of Terracotta, including bytecode manipulation libraries and the Terracotta server, are distributed in TAR and JAR formats. Some tools are packaged with the core package, but others are distributed as Terracotta Integration Modules.
- Eclipse Plugin
A plug-in for the Eclipse software development platform is available to aid developers in configuration and testing of Terracotta. The Terracotta eclipse plugin is available as a separate download.
References
Bibliography
- Zilka, Ari (June 23, 2008), The Definitive Guide to Terracotta: Cluster the JVM for Spring, Hibernate and POJO Scalability, Apress, pp. 368, ISBN 1590599861, http://apress.com/book/view/9781590599860
See also
External links
- Terracotta Official website
- Introduction to Terracotta
- Terracotta Tech: Cluster Your JVM To Simplify Application Architecture at Google Video (Adobe Flash video) by Ari Zilka, is the founder of Terracotta Technologies.
- Open Source Network-Attached Memory at Google Video (Adobe Flash video) by Ari Zilka, is the founder of Terracotta Technologies.
- Ari Zilka. "Stateful Session Clustering using Terracotta". http://www.devx.com/Java/Article/32603/.
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