|Deploying a GemFire XD Distributed System / Configuring Multi-site (WAN) Deployments|
Each distributed system in a multi-site configuration operates independently of the other connected systems. Each system can be configured as necessary for the resources available at the local site, as well as the local topology (peer-to-peer and/or client-server).
However, tables that are configured for replication between sites must be created using identical table names and column definitions. In addition, gateway senders and receivers must be configured to assign logical gateway connections to physical network connections in each system.
If the queue of DML events becomes too full, it is overflowed to a disk store to keep the member from running out of memory. Optionally, you can configure the queue to be persisted to disk. With persistence, if the member that manages the queue goes down, the member picks up where it left off after it is restarted.