Example - Presto Router Custom Scheduler Plugin

This package contains an example of a custom scheduler plugin.

Add the Custom Scheduler Plugin to the Presto Router

Place the plugin jar and all the dependent jars for the plugin in the plugin directory relative to the Presto install directory.

The configuration file for this plugin must be etc/router-config/router-scheduler.properties.
In router-scheduler.properties, set the name of the custom scheduler factory.
For example, use the following line to set the custom scheduler factory name to metricsBased.
router-scheduler.name=metricsBased

The scheduler name must be set to CUSTOM_PLUGIN_SCHEDULER in etc/router-config.json.
scheduler: CUSTOM_PLUGIN_SCHEDULER

Main Classes:

• RouterSchedulerPlugin - Custom Scheduler Plugin class to be loaded by the Router plugin manager.
  This class implements the interface com.facebook.presto.spi.RouterPlugin.
• MetricsBasedSchedulerFactory - Factory for creating specific custom scheduler.
  This class implements the interface com.facebook.presto.spi.SchedulerFactory.
• MetricsBasedScheduler - Example custom scheduler implementing the scheduling logic for clusters.
  This class implements the interface com.facebook.presto.spi.router.Scheduler.
  Similar classes can be added implementing specific custom scheduling logic.