Package org.apache.solr.cluster.placement.plugins

Class SimplePlacementFactory

java.lang.Object

org.apache.solr.cluster.placement.plugins.SimplePlacementFactory

All Implemented Interfaces:

ConfigurablePlugin<PlacementPluginFactory.NoConfig>, PlacementPluginFactory<PlacementPluginFactory.NoConfig>

public class SimplePlacementFactory
extends Object
implements PlacementPluginFactory<PlacementPluginFactory.NoConfig>

Factory for creating SimplePlacementFactory.SimplePlacementPlugin, a placement plugin implementing the logic from the old LegacyAssignStrategy. This chooses nodes with the fewest cores (especially cores of the same collection).

See AffinityPlacementFactory for a more realistic example and documentation.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SimplePlacementFactory.SimplePlacementPlugin

Nested classes/interfaces inherited from interface org.apache.solr.cluster.placement.PlacementPluginFactory

PlacementPluginFactory.NoConfig

Field Summary

Fields inherited from interface org.apache.solr.cluster.placement.PlacementPluginFactory

PLUGIN_NAME

Constructor Summary

Constructors

Constructor	Description
SimplePlacementFactory()

Method Summary

Modifier and Type	Method	Description
PlacementPlugin	createPluginInstance()	Returns an instance of the plugin that will be repeatedly (and concurrently) called to compute placement.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.solr.cluster.placement.PlacementPluginFactory

configure, getConfig

Constructor Detail

SimplePlacementFactory

public SimplePlacementFactory()

Method Detail

createPluginInstance

public PlacementPlugin createPluginInstance()

Description copied from interface: PlacementPluginFactory

Returns an instance of the plugin that will be repeatedly (and concurrently) called to compute placement. Multiple instances of a plugin can be used in parallel (for example if configuration has to change, but plugin instances with the previous configuration are still being used).

If this method returns null then a simple default assignment strategy will be used (see SimplePlacementFactory).

Specified by:

createPluginInstance in interface PlacementPluginFactory<PlacementPluginFactory.NoConfig>