org.apache.hadoop.hbase.master.balancer

Class StochasticLoadBalancer.RegionCountSkewCostFunction

java.lang.Object

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

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

Enclosing class:

StochasticLoadBalancer

static class StochasticLoadBalancer.RegionCountSkewCostFunction
extends StochasticLoadBalancer.CostFunction

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

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static float	DEFAULT_REGION_COUNT_SKEW_COST
(package private) static String	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
RegionCountSkewCostFunction(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
protected double	cost()
(package private) void	init(BaseLoadBalancer.Cluster cluster) Called once per LB invocation to give the cost function to initialize it's state, and perform any costly calculation.

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

costFromArray, getMultiplier, isNeeded, postAction, regionMoved, scale, setMultiplier

Methods inherited from class java.lang.Object

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

Field Detail

REGION_COUNT_SKEW_COST_KEY

static final String REGION_COUNT_SKEW_COST_KEY

See Also:

Constant Field Values

DEFAULT_REGION_COUNT_SKEW_COST

static final float DEFAULT_REGION_COUNT_SKEW_COST

See Also:

Constant Field Values

stats

private double[] stats

Constructor Detail

RegionCountSkewCostFunction

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

Method Detail

init

void init(BaseLoadBalancer.Cluster cluster)

Description copied from class: StochasticLoadBalancer.CostFunction

Called once per LB invocation to give the cost function to initialize it's state, and perform any costly calculation.

Overrides:

init in class StochasticLoadBalancer.CostFunction

cost

protected double cost()

Specified by:

cost in class StochasticLoadBalancer.CostFunction