Demonstration: active asynchronous transaction management in high-autonomy federated environment using data agents: Global Change Master Directory v8.0

The Global Change Master Directory (GCMD) is an Earth science information repository that specifically tracks research data on global climatic change. Building a directory of Earth science metadata that allows the exchange of metadata content among partner organizations is challenging due to the complex issues involved in supporting heterogeneous metadata schema, database schema, database implementation and platforms. This demonstration presents the design of the MD8 (Master Directory v8.0), which allows automated exchange of metadata content among Earth science collaborators through a proposed asynchronous distributed transaction protocol. Specifically, the demonstration focuses on the local data agent that captures local database updates and broadcasts them to other cooperating nodes asynchronously using an announcer