StochasticLoadBalancer.RegionReplicaCandidateGenerator (Apache HBase 1.2.12 API)

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java.lang.Object
- org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CandidateGenerator
- - org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.RegionReplicaCandidateGenerator

Direct Known Subclasses:

StochasticLoadBalancer.RegionReplicaRackCandidateGenerator

Enclosing class:

StochasticLoadBalancer
```
static class StochasticLoadBalancer.RegionReplicaCandidateGenerator
extends StochasticLoadBalancer.CandidateGenerator
```
Generates candidates which moves the replicas out of the region server for co-hosted region replicas

Field Summary

Fields
Modifier and Type Field and Description

(package private) StochasticLoadBalancer.RandomCandidateGenerator randomGenerator

Constructor Summary

Constructors
Constructor and Description

StochasticLoadBalancer.RegionReplicaCandidateGenerator()

Method Summary

Methods
Modifier and Type	Method and Description
`(package private) BaseLoadBalancer.Cluster.Action`	`generate(BaseLoadBalancer.Cluster cluster)`
`(package private) int`	`selectCoHostedRegionPerGroup(int[] primariesOfRegionsPerGroup, int[] regionsPerGroup, int[] regionIndexToPrimaryIndex)` Randomly select one regionIndex out of all region replicas co-hosted in the same group (a group is a server, host or rack)

Methods inherited from class org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CandidateGenerator
getAction, pickOtherRandomRack, pickOtherRandomServer, pickRandomRack, pickRandomRegion, pickRandomRegions, pickRandomServer

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - randomGenerator
```
StochasticLoadBalancer.RandomCandidateGenerator randomGenerator
```
- Constructor Detail
  - StochasticLoadBalancer.RegionReplicaCandidateGenerator
```
StochasticLoadBalancer.RegionReplicaCandidateGenerator()
```
- Method Detail
  - selectCoHostedRegionPerGroup
```
int selectCoHostedRegionPerGroup(int[] primariesOfRegionsPerGroup,
                               int[] regionsPerGroup,
                               int[] regionIndexToPrimaryIndex)
```
    Randomly select one regionIndex out of all region replicas co-hosted in the same group (a group is a server, host or rack)
    
    Parameters:
    primariesOfRegionsPerGroup - either Cluster.primariesOfRegionsPerServer, primariesOfRegionsPerHost or primariesOfRegionsPerRack
    regionsPerGroup - either Cluster.regionsPerServer, regionsPerHost or regionsPerRack
    regionIndexToPrimaryIndex - Cluster.regionsIndexToPrimaryIndex
    
    Returns:
    a regionIndex for the selected primary or -1 if there is no co-locating
  - generate
```
BaseLoadBalancer.Cluster.Action generate(BaseLoadBalancer.Cluster cluster)
```
    Specified by:
    
    generate in class StochasticLoadBalancer.CandidateGenerator

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