org.apache.hadoop.hbase.master.balancer

Class CostFromRegionLoadFunction

java.lang.Object

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

org.apache.hadoop.hbase.master.balancer.CostFromRegionLoadFunction

Direct Known Subclasses:

CostFromRegionLoadAsRateFunction, StoreFileCostFunction

@InterfaceAudience.Private
abstract class CostFromRegionLoadFunction
extends CostFunction

Base class the allows writing costs functions from rolling average of some number from RegionLoad.

Field Summary

Fields

Modifier and Type	Field and Description
private DoubleArrayCost	cost

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

cluster, COST_EPSILON

Constructor Summary

Constructors

Constructor and Description
CostFromRegionLoadFunction()

Method Summary

Modifier and Type	Method and Description
private double	computeCostForRegionServer(int regionServerIndex)
protected double	cost()
protected abstract double	getCostFromRl(BalancerRegionLoad rl)
protected double	getRegionLoadCost(Collection<BalancerRegionLoad> regionLoadList)
(package private) void	prepare(BalancerClusterState cluster) Called once per LB invocation to give the cost function to initialize it's state, and perform any costly calculation.
protected void	regionMoved(int region, int oldServer, int newServer)

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

getMultiplier, isNeeded, postAction, scale, setMultiplier, updateWeight

Methods inherited from class java.lang.Object

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

Field Detail

cost

private final DoubleArrayCost cost

Constructor Detail

CostFromRegionLoadFunction

CostFromRegionLoadFunction()

Method Detail

computeCostForRegionServer

private double computeCostForRegionServer(int regionServerIndex)

prepare

void prepare(BalancerClusterState cluster)

Description copied from class: CostFunction

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

Overrides:

prepare in class CostFunction

regionMoved

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

Overrides:

regionMoved in class CostFunction

cost

protected final double cost()

Specified by:

cost in class CostFunction

getRegionLoadCost

protected double getRegionLoadCost(Collection<BalancerRegionLoad> regionLoadList)

getCostFromRl

protected abstract double getCostFromRl(BalancerRegionLoad rl)