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27.5. Configure Multiple Site Masters

A standard Red Hat JBoss Data Grid cross-datacenter replication configuration includes one master node for each site. The master node is a gateway for other nodes to communicate with the master nodes at other sites.
This standard configuration works for a simple cross-datacenter replication configuration. However, with a larger volume of traffic between the sites, passing traffic through a single master node can create a bottleneck, which slows communication across nodes.
In JBoss Data Grid, configure multiple master nodes for each site to optimize traffic across multiple sites.
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27.5.1. Multiple Site Master Operations
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When multiple site masters are enabled and configured, the master nodes in each site joins the local cluster (i.e. the local site) as well as the global cluster (which includes nodes that are members of multiple sites).
Each node that acts as a site master and maintains a routing table that consists of a list of target sites and site masters. When a message arrives, a random master node for the destination site is selected. The message is then forwarded to the random master node, where it is sent to the destination node (unless the randomly selected node was the destination).
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