Regarding HA features in GlassFish v2, is there Clustra functionality in there?

Dhiru Pandey:

The HA feature in GlassFish v2 is based on an implementation of in-memory replication for session state (HTTP, EJB and SSO). This implementation is layered on top of Shoal and JXTA, which provide the necessary group membership functionality as well as the necessary communication framework for this.

Here are some other links to related information:

• In-Memory Replication for Session Replication (HTTP / SFSB)
• GlassFish Application Server: Present and Future