A "listen" entry causes a node (receiver) to query an event provider for events that originate from a specific node, as well as confirmations from every existing node. It requires a "path" to exist so that the receiver (as client) can connect to the provider (as server).
Every node in the system must listen for events from every other node in the system. As a general rule of thumb, a subscriber (see SLONIK SUBSCRIBE SET) should listen for events of the set's origin on the same provider, where it receives the data from. In turn, the origin of the data set should listen for events from the origin in the opposite direction. A node can listen for events from one and the same origin on different providers at the same time. However, to process SYNC events from that origin, all data providers must have the same or higher sync status, so this will not result in any faster replication behaviour.
- ORIGIN = ival
Node ID of the event origin the receiver is listening for.
- PROVIDER = ival
Node ID of the node from which the receiver gets events that come from the origin. If not specified, default is the origin.
- RECEIVER = ival
The ID of the node receiving the events.
For more details, see Section 4.2.
Slonik Event Confirmation Behaviour
Slonik waits for the command submitted to the previous event node to be confirmed on the specified event node before submitting this command.
This command was introduced in Slony-I 1.0. As of version 1.1, you should no longer need to use this command, as listen paths are generated automatically.