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

Class ReadRequestCostFunction

java.lang.Object

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

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

org.apache.hadoop.hbase.master.balancer.CostFromRegionLoadAsRateFunction

org.apache.hadoop.hbase.master.balancer.ReadRequestCostFunction

@Private
class ReadRequestCostFunction
extends CostFromRegionLoadAsRateFunction

Compute the cost of total number of read requests The more unbalanced the higher the computed cost will be. This uses a rolling average of regionload.

Field Summary

Fields

Modifier and Type	Field	Description
private static final float	DEFAULT_READ_REQUEST_COST
private static final String	READ_REQUEST_COST_KEY

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

cluster, COST_EPSILON

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected double	getCostFromRl(BalancerRegionLoad rl)

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

getRegionLoadCost

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

cost, prepare, regionMoved

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

READ_REQUEST_COST_KEY

private static final String READ_REQUEST_COST_KEY

See Also:

• Constant Field Values

DEFAULT_READ_REQUEST_COST

private static final float DEFAULT_READ_REQUEST_COST

See Also:

• Constant Field Values

Constructor Details

ReadRequestCostFunction

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

Method Details

getCostFromRl

protected double getCostFromRl(BalancerRegionLoad rl)

Specified by:

getCostFromRl in class CostFromRegionLoadFunction