org.apache.druid.server.coordinator.loading

Class ReplicationThrottler

java.lang.Object

org.apache.druid.server.coordinator.loading.ReplicationThrottler

public class ReplicationThrottler
extends Object

The ReplicationThrottler is used to throttle the number of segment replicas that are assigned to a load queue in a single run. This is achieved by setting the values of the following configs:

• CoordinatorDynamicConfig.getReplicationThrottleLimit() - Maximum number of replicas that can be assigned to a tier in a single run.
• CoordinatorDynamicConfig.getMaxNonPrimaryReplicantsToLoad() - Maximum number of total replicas that can be assigned across all tiers in a single run.

Constructor Summary

Constructors

Constructor and Description
ReplicationThrottler(Set<String> tiersLoadingReplicas, int replicationThrottleLimit, int maxReplicaAssignmentsInRun) Creates a new ReplicationThrottler for use during a single coordinator run.

Method Summary

Modifier and Type	Method and Description
boolean	canAssignReplica(String tier)
void	incrementAssignedReplicas(String tier)
boolean	isTierLoadingReplicas(String tier)

Methods inherited from class java.lang.Object

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

Constructor Detail

ReplicationThrottler

public ReplicationThrottler(Set<String> tiersLoadingReplicas,
                            int replicationThrottleLimit,
                            int maxReplicaAssignmentsInRun)

Creates a new ReplicationThrottler for use during a single coordinator run.

Parameters:

tiersLoadingReplicas - Set of tier names which are already loading replicas and will not be eligible for loading more replicas in this run.

replicationThrottleLimit - Maximum number of replicas that can be assigned to a single tier in the current run.

maxReplicaAssignmentsInRun - Max number of total replicas that can be assigned across all tiers in the current run.

Method Detail

isTierLoadingReplicas

public boolean isTierLoadingReplicas(String tier)

canAssignReplica

public boolean canAssignReplica(String tier)

incrementAssignedReplicas

public void incrementAssignedReplicas(String tier)