Package org.apache.hadoop.hbase.master.balancer

Class CacheAwareLoadBalancer.CacheAwareCostFunction

java.lang.Object

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

org.apache.hadoop.hbase.master.balancer.CacheAwareLoadBalancer.CacheAwareCostFunction

Enclosing class:

CacheAwareLoadBalancer

static class CacheAwareLoadBalancer.CacheAwareCostFunction
extends CostFunction

Field Summary

Fields

Modifier and Type	Field	Description
private double	bestCacheRatio
private static final String	CACHE_COST_KEY
private double	cacheRatio
private static final float	DEFAULT_CACHE_COST

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

cluster, COST_EPSILON

Constructor Summary

Constructors

Constructor	Description
CacheAwareCostFunction(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method	Description
protected double	cost()
private int	getServerWithBestCacheRatioForRegion(int region)
(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)
final 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 org.apache.hadoop.hbase.master.balancer.CostFunction

getMultiplier, isNeeded, postAction, scale, setMultiplier

Methods inherited from class java.lang.Object

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

Field Details

CACHE_COST_KEY

private static final String CACHE_COST_KEY

See Also:

• Constant Field Values

cacheRatio

private double cacheRatio

bestCacheRatio

private double bestCacheRatio

DEFAULT_CACHE_COST

private static final float DEFAULT_CACHE_COST

See Also:

• Constant Field Values

Constructor Details

CacheAwareCostFunction

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

Method Details

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

cost

protected double cost()

Specified by:

cost in class CostFunction

regionMoved

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

Overrides:

regionMoved in class CostFunction

getServerWithBestCacheRatioForRegion

private int getServerWithBestCacheRatioForRegion(int region)

updateWeight

public final void updateWeight(double[] weights)

Description copied from class: CostFunction

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.

Overrides:

updateWeight in class CostFunction

Parameters:

weights - the weights for every generator.