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

Class RegionReplicaRackCostFunction

java.lang.Object

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

org.apache.hadoop.hbase.master.balancer.RegionReplicaGroupingCostFunction

org.apache.hadoop.hbase.master.balancer.RegionReplicaRackCostFunction

@Private
class RegionReplicaRackCostFunction
extends RegionReplicaGroupingCostFunction

A cost function for region replicas for the rack distribution. We give a relatively high cost to hosting replicas of the same region in the same rack. We do not prevent the case though.

Field Summary

Fields

Modifier and Type	Field	Description
private static final float	DEFAULT_REGION_REPLICA_RACK_COST_KEY
private static final String	REGION_REPLICA_RACK_COST_KEY

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

costsPerGroup, maxCost

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

cluster, COST_EPSILON

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected void	loadCosts()
protected void	regionMoved(int region, int oldServer, int newServer)

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

cost, costPerGroup, getMaxCost, isNeeded, prepare, updateWeight

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

getMultiplier, postAction, scale, setMultiplier

Methods inherited from class java.lang.Object

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

Field Details

REGION_REPLICA_RACK_COST_KEY

private static final String REGION_REPLICA_RACK_COST_KEY

See Also:

• Constant Field Values

DEFAULT_REGION_REPLICA_RACK_COST_KEY

private static final float DEFAULT_REGION_REPLICA_RACK_COST_KEY

See Also:

• Constant Field Values

Constructor Details

RegionReplicaRackCostFunction

public RegionReplicaRackCostFunction(org.apache.hadoop.conf.Configuration conf)

Method Details

loadCosts

protected void loadCosts()

Specified by:

loadCosts in class RegionReplicaGroupingCostFunction

regionMoved

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

Overrides:

regionMoved in class CostFunction