org.apache.hadoop.hbase.master.balancer

Class StochasticLoadBalancer.CostFunction

java.lang.Object

org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CostFunction

Direct Known Subclasses:

HeterogeneousRegionCountCostFunction

Enclosing class:

StochasticLoadBalancer

public abstract static class StochasticLoadBalancer.CostFunction
extends Object

Base class of StochasticLoadBalancer's Cost Functions.

Field Summary

Fields

Modifier and Type	Field and Description
protected BaseLoadBalancer.Cluster	cluster
static double	COST_EPSILON

Constructor Summary

Constructors

Constructor and Description
CostFunction(org.apache.hadoop.conf.Configuration c)

Method Summary

Modifier and Type	Method and Description
protected abstract double	cost()
protected void	regionMoved(int region, int oldServer, int newServer)
void	updateWeight(double[] weights) Add the cost of this cost function to the weight of the candidate generator that is optimized for this cost function.

Methods inherited from class java.lang.Object

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

Field Detail

COST_EPSILON

public static final double COST_EPSILON

See Also:

Constant Field Values

cluster

protected BaseLoadBalancer.Cluster cluster

Constructor Detail

CostFunction

public CostFunction(org.apache.hadoop.conf.Configuration c)

Method Detail

regionMoved

protected void regionMoved(int region,
                           int oldServer,
                           int newServer)

cost

protected abstract double cost()

updateWeight

public void updateWeight(double[] weights)

Add the cost of this cost function to the weight of the candidate generator that is optimized for this cost function. By default it is the RandomCandiateGenerator for a cost function. Called once per init or after postAction.

Parameters:

weights - the weights for every generator.