org.apache.hadoop.hbase.master.balancer

Class StochasticLoadBalancer.PrimaryRegionCountSkewCostFunction

java.lang.Object

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

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

Enclosing class:

StochasticLoadBalancer

static class StochasticLoadBalancer.PrimaryRegionCountSkewCostFunction
extends StochasticLoadBalancer.CostFunction

Compute the cost of a potential cluster state from skew in number of primary regions on a cluster.

Field Summary

Fields

Modifier and Type	Field and Description
private static float	DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST
private static String	PRIMARY_REGION_COUNT_SKEW_COST_KEY
private double[]	stats

Fields inherited from class org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CostFunction

cluster

Constructor Summary

Constructors

Constructor and Description
PrimaryRegionCountSkewCostFunction(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
(package private) double	cost()
(package private) boolean	isNeeded()

Methods inherited from class org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CostFunction

costFromArray, getMultiplier, init, postAction, regionMoved, scale, setMultiplier

Methods inherited from class java.lang.Object

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

Field Detail

PRIMARY_REGION_COUNT_SKEW_COST_KEY

private static final String PRIMARY_REGION_COUNT_SKEW_COST_KEY

See Also:

Constant Field Values

DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST

private static final float DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST

See Also:

Constant Field Values

stats

private double[] stats

Constructor Detail

PrimaryRegionCountSkewCostFunction

PrimaryRegionCountSkewCostFunction(org.apache.hadoop.conf.Configuration conf)

Method Detail

isNeeded

boolean isNeeded()

Overrides:

isNeeded in class StochasticLoadBalancer.CostFunction

cost

double cost()

Specified by:

cost in class StochasticLoadBalancer.CostFunction