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

Class RegionReplicaHostCostFunction

java.lang.Object

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

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

org.apache.hadoop.hbase.master.balancer.RegionReplicaHostCostFunction

@Private
class RegionReplicaHostCostFunction
extends RegionReplicaGroupingCostFunction

A cost function for region replicas. We give a very high cost to hosting replicas of the same region in the same host. We do not prevent the case though, since if numReplicas > numRegionServers, we still want to keep the replica open.

Field Summary

Fields

Modifier and Type	Field	Description
private org.agrona.collections.Int2IntCounterMap[]	colocatedReplicaCountsPerGroup
private static final float	DEFAULT_REGION_REPLICA_HOST_COST_KEY
private static final String	REGION_REPLICA_HOST_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
RegionReplicaHostCostFunction(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_HOST_COST_KEY

private static final String REGION_REPLICA_HOST_COST_KEY

See Also:

• Constant Field Values

DEFAULT_REGION_REPLICA_HOST_COST_KEY

private static final float DEFAULT_REGION_REPLICA_HOST_COST_KEY

See Also:

• Constant Field Values

colocatedReplicaCountsPerGroup

private org.agrona.collections.Int2IntCounterMap[] colocatedReplicaCountsPerGroup

Constructor Details

RegionReplicaHostCostFunction

public RegionReplicaHostCostFunction(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