When you set up multiple partitions in a session that contains web service source and target definitions, the Integration Service creates a connection to the Web Services Hub based on the number of sources, targets, and partitions in the session. For example, if you configure three partitions in a session that contains one source and one target, the Integration Service creates six connections to the Web Services Hub, three for the source and three for the target. The partitions allow for concurrent execution of web service requests.

When you run a multi-partitioned session, the Web Services Hub uses a source connection to pass a request to the Integration Service. The Integration Service uses a target connection to send a response to the Web Services Hub. The Web Services Hub and the Integration Service use the source and target connections in a round-robin fashion.

When you configure partitions for a web service mapping, you can configure pass-through partitions for web service sources and targets.