org.apache.hadoop.hbase.master.balancer

Class StochasticLoadBalancer.RegionReplicaRackCostFunction

java.lang.Object

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

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

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

Enclosing class:

StochasticLoadBalancer

static class StochasticLoadBalancer.RegionReplicaRackCostFunction
extends StochasticLoadBalancer.RegionReplicaHostCostFunction

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 and Description
private static float	DEFAULT_REGION_REPLICA_RACK_COST_KEY
private static String	REGION_REPLICA_RACK_COST_KEY

Fields inherited from class org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.RegionReplicaHostCostFunction

costsPerGroup, maxCost, primariesOfRegionsPerGroup

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

cluster

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
(package private) void	init(BaseLoadBalancer.Cluster 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.StochasticLoadBalancer.RegionReplicaHostCostFunction

cost, costPerGroup, getMaxCost, isNeeded

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

costFromArray, getMultiplier, postAction, scale, setMultiplier

Methods inherited from class java.lang.Object

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

Field Detail

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 Detail

RegionReplicaRackCostFunction

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

Method Detail

init

void init(BaseLoadBalancer.Cluster cluster)

Description copied from class: StochasticLoadBalancer.CostFunction

Called once per LB invocation to give the cost function to initialize it's state, and perform any costly calculation.

Overrides:

init in class StochasticLoadBalancer.RegionReplicaHostCostFunction

regionMoved

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

Overrides:

regionMoved in class StochasticLoadBalancer.RegionReplicaHostCostFunction