HTTP Session Clustering

Terracotta is used by Java websites both large and small to cluster web sessions. When clustered by Terracotta, web application session becomes highly available without actually being replicated to every app server in the cluster. This leads to scalable applications especially when used in conjunction with an HTTP load balancer.

Simple - integrates with existing applications

Broad platform support

Works with Tomcat, Jetty, Weblogic, Websphere, JBoss, and Geronimo
Works with any combination of these as well
No need for expensive "clustered" application servers

Easy integration

Session attributes do not need to implement java.io.Serializable
No need to call setAttribute() every time an attribute changes

Transparent clustering

Use it with many OSS web frameworks including Struts 1, Wicket, Rife, Spring Webflow & MVC

Getting started...

Session Configurator helps install and configure

Fast - no serialization and no unneeded replication

Fine grained – works with large sessions by pushing only what changes (even smaller than a single attribute)
Linearly scalable – Terracotta cluster is separate of your app. It keeps track of which app servers need which sessions and updates.
Faster than buddy system replication when used with sticky load balancers
Fast even with multi-megabyte session objects

Reliable - No sessions get lost

Supports rolling upgrades to your web application
Active / passive Terracotta cluster failover without interruption

Resources