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|Oracle GlassFish Server 3.1-3.1.1 High Availability Administration Guide|
A cluster is a collection of GlassFish Server instances that work together as one logical entity. A cluster provides a runtime environment for one or more Java Platform, Enterprise Edition (Java EE) applications. A cluster provides high availability through failure protection, scalability, and load balancing.
The Group Management Service (GMS) enables instances to participate in a cluster by detecting changes in cluster membership and notifying instances of the changes. To ensure that GMS can detect changes in cluster membership, a cluster's GMS settings must be configured correctly.
The following topics are addressed here: