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2.5. Advanced Configuration
Features such as server discovery, load balancing, failover, retry, and retry delay, may be customized if the default policy is not appropriate. Refer to the
org.teiid.net.socket.ServerDiscovery interface and default implementation org.teiid.net.socket.UrlServerDiscovery for more information on customization.
The
UrlServerDiscovery implementation provides the following features:
- discovery of servers from URL hosts (including the data source server and alternative servers)
- random selection for load balancing and failover
- one connection attempt per host
- no biasing
- black listing
Typically you'll want to extend the
UrlServerDiscovery so that it can be used as the fall-back strategy and to only implement the necessary changed methods. It is important to consider that one ServerDiscovery instance will be created for each connection. Any sharing of information between instances should be done through static state or some other shared lookup.
Your customized server discovery class must be referenced by the
discoveryStrategy connection/DataSource property using its full class name.
