org.apache.druid.server.coordinator.rules

Class DropRule

java.lang.Object

org.apache.druid.server.coordinator.rules.DropRule

All Implemented Interfaces:

Rule

Direct Known Subclasses:

ForeverDropRule, IntervalDropRule, PeriodDropBeforeRule, PeriodDropRule

public abstract class DropRule
extends Object
implements Rule

DropRules indicate when segments should be completely removed from the cluster.

Constructor Summary

Constructors

Constructor and Description
DropRule()

Method Summary

Modifier and Type	Method and Description
boolean	canLoadSegments() Return true if this Rule can load segment onto one or more type of Druid node, otherwise return false.
CoordinatorStats	run(DruidCoordinator coordinator, DruidCoordinatorRuntimeParams params, DataSegment segment) DruidCoordinatorRuntimeParams.getUsedSegments() must not be called in Rule's code, because the used segments are not specified for the DruidCoordinatorRuntimeParams passed into Rule's code.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.server.coordinator.rules.Rule

appliesTo, appliesTo, getType, updateUnderReplicated, updateUnderReplicatedWithClusterView

Constructor Detail

DropRule

public DropRule()

Method Detail

run

public CoordinatorStats run(DruidCoordinator coordinator,
                            DruidCoordinatorRuntimeParams params,
                            DataSegment segment)

Description copied from interface: Rule

DruidCoordinatorRuntimeParams.getUsedSegments() must not be called in Rule's code, because the used segments are not specified for the DruidCoordinatorRuntimeParams passed into Rule's code. This is because DruidCoordinatorRuntimeParams entangles two slightly different (nonexistent yet) abstractions: "CoordinatorDutyParams" and "RuleParams" which contain params that only CoordinatorDuty objects and Rules need, respectively. For example, ReplicationThrottler needs to belong only to "RuleParams", but not to "CoordinatorDutyParams". The opposite for the collection of used segments and DataSourcesSnapshot. See https://github.com/apache/druid/issues/7228

Specified by:

run in interface Rule

canLoadSegments

public boolean canLoadSegments()

Description copied from interface: Rule

Return true if this Rule can load segment onto one or more type of Druid node, otherwise return false. Any Rule that returns true for this method should implement logic for calculating segment under replicated in Rule.updateUnderReplicated(java.util.Map<java.lang.String, it.unimi.dsi.fastutil.objects.Object2LongMap<java.lang.String>>, org.apache.druid.server.coordinator.SegmentReplicantLookup, org.apache.druid.timeline.DataSegment)

Specified by:

canLoadSegments in interface Rule