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

Class MoveCostFunction

java.lang.Object

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

org.apache.hadoop.hbase.master.balancer.MoveCostFunction

@Private
class MoveCostFunction
extends CostFunction

Given the starting state of the regions and a potential ending state compute cost based upon the number of regions that have moved.

Field Summary

Fields

Modifier and Type	Field	Description
private static final float	DEFAULT_MAX_MOVE_PERCENT
private static final int	DEFAULT_MAX_MOVES
(package private) static final float	DEFAULT_MOVE_COST
(package private) static final float	DEFAULT_MOVE_COST_OFFPEAK
private static final String	MAX_MOVES_PERCENT_KEY
private final float	maxMovesPercent
private static final String	MOVE_COST_KEY
private static final String	MOVE_COST_OFFPEAK_KEY
private final float	moveCost
private final float	moveCostOffPeak
private final OffPeakHours	offPeakHours

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

cluster, COST_EPSILON

Constructor Summary

Constructors

Constructor	Description
MoveCostFunction(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.

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

getMultiplier, isNeeded, postAction, regionMoved, scale, setMultiplier, updateWeight

Methods inherited from class java.lang.Object

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

Field Details

MOVE_COST_KEY

private static final String MOVE_COST_KEY

See Also:

• Constant Field Values

MOVE_COST_OFFPEAK_KEY

private static final String MOVE_COST_OFFPEAK_KEY

See Also:

• Constant Field Values

MAX_MOVES_PERCENT_KEY

private static final String MAX_MOVES_PERCENT_KEY

See Also:

• Constant Field Values

DEFAULT_MOVE_COST

static final float DEFAULT_MOVE_COST

See Also:

• Constant Field Values

DEFAULT_MOVE_COST_OFFPEAK

static final float DEFAULT_MOVE_COST_OFFPEAK

See Also:

• Constant Field Values

DEFAULT_MAX_MOVES

private static final int DEFAULT_MAX_MOVES

See Also:

• Constant Field Values

DEFAULT_MAX_MOVE_PERCENT

private static final float DEFAULT_MAX_MOVE_PERCENT

See Also:

• Constant Field Values

maxMovesPercent

private final float maxMovesPercent

offPeakHours

private final OffPeakHours offPeakHours

moveCost

private final float moveCost

moveCostOffPeak

private final float moveCostOffPeak

Constructor Details

MoveCostFunction

MoveCostFunction(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