The Sybase RAP Publisher API uses multicast channels to route market data messages to subscribers, who deliver the data to the final destinations in the RAPCache and RAPStore. Publishing Sybase RAP data in a high availability environment requires a primary and secondary collection of publishers. Each collection includes one or more publishers that accept data from a feed handler and broadcast messages across a set of multicast channels specific to that collection. The primary collection of Publishers broadcasts on one set of multicast channels; the secondary collection broadcasts on another set of multicast channels.
