StochasticLoadBalancer.RegionReplicaRackCostFunction (Apache HBase 1.2.12 API)

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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

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

Method Summary

Methods
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

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
  - StochasticLoadBalancer.RegionReplicaRackCostFunction
```
public StochasticLoadBalancer.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

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