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|Oracle GlassFish Server 3.1-3.1.1 High Availability Administration Guide|
When a message-driven bean (MDB) application is deployed to a GlassFish cluster, incoming messages are delivered randomly to MDBs without regard to the cluster instances in which they are running.
If the MDB is configured to receive messages from a durable or non-durable subscription on a topic, then only one MDB instance across the whole GlassFish cluster will receive each message.
For more information about these features, see About Shared Topic Subscriptions for Clustered Containers in Oracle GlassFish Server Message Queue 4.5 Administration Guide.