Package org.apache.pulsar.broker.loadbalance.impl

Class UniformLoadShedder

java.lang.Object

org.apache.pulsar.broker.loadbalance.impl.UniformLoadShedder

All Implemented Interfaces:

LoadSheddingStrategy

public class UniformLoadShedder
extends Object
implements LoadSheddingStrategy

This strategy tends to distribute load uniformly across all brokers. This strategy checks load difference between broker with highest load and broker with lowest load. If the difference is higher than configured thresholds ServiceConfiguration.getLoadBalancerMsgRateDifferenceShedderThreshold() or ServiceConfiguration.getLoadBalancerMsgThroughputMultiplierDifferenceShedderThreshold() then it finds out bundles which can be unloaded to distribute traffic evenly across all brokers.

Constructor Summary

Constructors

Constructor	Description
UniformLoadShedder()

Method Summary

Modifier and Type	Method	Description
com.google.common.collect.Multimap<String,String>	findBundlesForUnloading(LoadData loadData, org.apache.pulsar.broker.ServiceConfiguration conf)	Attempt to shed some bundles off every broker which is overloaded.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.pulsar.broker.loadbalance.LoadSheddingStrategy

onActiveBrokersChange

Constructor Details

UniformLoadShedder

public UniformLoadShedder()

Method Details

findBundlesForUnloading

public com.google.common.collect.Multimap<String,String> findBundlesForUnloading(LoadData loadData,
 org.apache.pulsar.broker.ServiceConfiguration conf)

Attempt to shed some bundles off every broker which is overloaded.

Specified by:

findBundlesForUnloading in interface LoadSheddingStrategy

Parameters:

loadData - The load data to used to make the unloading decision.

conf - The service configuration.

Returns:

A map from bundles to unload to the brokers on which they are loaded.