Chapter 11. Writing Scalable Services
The Sun Cluster 3 release introduced the facility to run multiple instances of the same application on multiple nodes of a cluster using the same set of data and the same network address, regardless of the physical node on which an instance is run. In the Sun Cluster 3 environment, an application deployed in this manner is called a scalable service, since the number of instances can be “scaled” dynamically from one to many and back again, without bringing the entire service offline at any point. Up until now, this book has covered the other type of data service available on the Sun Cluster platform: the failover service. As we’ve seen, a failover service has only one instance of an application active in the ...
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