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

Class TableSkewCostFunction

java.lang.Object

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

org.apache.hadoop.hbase.master.balancer.TableSkewCostFunction

@Private
class TableSkewCostFunction
extends CostFunction

Compute the cost of a potential cluster configuration based upon how evenly distributed tables are.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) DoubleArrayCost[]	costsPerTable
private static final float	DEFAULT_TABLE_SKEW_COST
private static final String	TABLE_SKEW_COST_KEY

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

cluster, COST_EPSILON

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected double	cost()
(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 Details

TABLE_SKEW_COST_KEY

private static final String TABLE_SKEW_COST_KEY

See Also:

• Constant Field Values

DEFAULT_TABLE_SKEW_COST

private static final float DEFAULT_TABLE_SKEW_COST

See Also:

• Constant Field Values

costsPerTable

DoubleArrayCost[] costsPerTable

Constructor Details

TableSkewCostFunction

TableSkewCostFunction(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

regionMoved

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

Overrides:

regionMoved in class CostFunction

cost

protected double cost()

Specified by:

cost in class CostFunction