10.8. Event Listener

• Query creation
• Split completion (success or failure)This functionality enables development of custom logging, debugging andperformance analysis plugins. In a Presto cluster, only a single eventlistener plugin can be active at a time .

is responsible for creating anEventListener instance. It also defines an EventListenername which is used by the administrator in a Presto configuration.Implementations of EventListener implement methods for the event typesthey are interested in handling.

Configuration

After a plugin that implements EventListener andEventListenerFactory has been installed on the coordinator, it isconfigured using an etc/event-listener.properties file. All of theproperties other than event-listener.name are specific to the implementation.

Example configuration file: