public interface LoadBalancer
extends org.apache.hadoop.conf.Configurable
Cluster-wide load balancing will occur only when there are no regions in
transition and according to a fixed period of a time using balanceCluster(Map)
.
Inline region placement with immediateAssignment(java.util.List<org.apache.hadoop.hbase.HRegionInfo>, java.util.List<org.apache.hadoop.hbase.ServerName>)
can be used when
the Master needs to handle closed regions that it currently does not have
a destination set for. This can happen during master failover.
On cluster startup, bulk assignment can be used to determine locations for all Regions in a cluster.
This classes produces plans for the AssignmentManager
to execute.
Modifier and Type | Method and Description |
---|---|
List<RegionPlan> |
balanceCluster(Map<ServerName,List<HRegionInfo>> clusterState)
Perform the major balance operation
|
Map<HRegionInfo,ServerName> |
immediateAssignment(List<HRegionInfo> regions,
List<ServerName> servers)
Sync assign a region
|
ServerName |
randomAssignment(List<ServerName> servers)
Get a random region server from the list
|
Map<ServerName,List<HRegionInfo>> |
retainAssignment(Map<HRegionInfo,ServerName> regions,
List<ServerName> servers)
Assign regions to the previously hosting region server
|
Map<ServerName,List<HRegionInfo>> |
roundRobinAssignment(List<HRegionInfo> regions,
List<ServerName> servers)
Perform a Round Robin assignment of regions.
|
void |
setClusterStatus(ClusterStatus st)
Set the current cluster status.
|
void |
setMasterServices(MasterServices masterServices)
Set the master service.
|
void setClusterStatus(ClusterStatus st)
st
- void setMasterServices(MasterServices masterServices)
masterServices
- List<RegionPlan> balanceCluster(Map<ServerName,List<HRegionInfo>> clusterState)
clusterState
- Map<ServerName,List<HRegionInfo>> roundRobinAssignment(List<HRegionInfo> regions, List<ServerName> servers)
regions
- servers
- Map<ServerName,List<HRegionInfo>> retainAssignment(Map<HRegionInfo,ServerName> regions, List<ServerName> servers)
regions
- servers
- Map<HRegionInfo,ServerName> immediateAssignment(List<HRegionInfo> regions, List<ServerName> servers)
regions
- servers
- ServerName randomAssignment(List<ServerName> servers)
servers
- Copyright © 2014 The Apache Software Foundation. All Rights Reserved.