Terracotta Cluster

Terracotta
Developer(s)	Terracotta, Inc
Stable release	3.0 / 2009-04-14; 2 months ago
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

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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

[edit] 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.

[edit] 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) is available to aid developers in configuration and testing of Terracotta. The Terracotta eclipse plugin is available as a separate download.