org.apache.hadoop.hbase.master.balancer

Class BaseLoadBalancer.Cluster

java.lang.Object

org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster

Enclosing class:

BaseLoadBalancer

protected static class BaseLoadBalancer.Cluster
extends java.lang.Object

An efficient array based implementation similar to ClusterState for keeping the status of the cluster in terms of region assignment and distribution. LoadBalancers, such as StochasticLoadBalancer uses this Cluster object because of hundreds of thousands of hashmap manipulations are very costly, which is why this class uses mostly indexes and arrays. Cluster tracks a list of unassigned regions, region assignments, and the server topology in terms of server names, hostnames and racks.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BaseLoadBalancer.Cluster.Action An action to move or swap a region
static class	BaseLoadBalancer.Cluster.AssignRegionAction
static class	BaseLoadBalancer.Cluster.MoveRegionAction
static class	BaseLoadBalancer.Cluster.SwapRegionsAction

Field Summary

Fields

Modifier and Type	Field and Description
static BaseLoadBalancer.Cluster.Action	NullAction
protected RackManager	rackManager

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Cluster(java.util.Collection<HRegionInfo> unassignedRegions, java.util.Map<ServerName,java.util.List<HRegionInfo>> clusterState, java.util.Map<java.lang.String,java.util.Deque<RegionLoad>> loads, org.apache.hadoop.hbase.master.balancer.RegionLocationFinder regionFinder, RackManager rackManager)
protected	Cluster(java.util.Map<ServerName,java.util.List<HRegionInfo>> clusterState, java.util.Map<java.lang.String,java.util.Deque<RegionLoad>> loads, org.apache.hadoop.hbase.master.balancer.RegionLocationFinder regionFinder, RackManager rackManager)

Method Summary

Modifier and Type	Method and Description
void	doAction(BaseLoadBalancer.Cluster.Action action)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

rackManager

protected final RackManager rackManager

NullAction

public static final BaseLoadBalancer.Cluster.Action NullAction

Constructor Detail

Cluster

protected Cluster(java.util.Map<ServerName,java.util.List<HRegionInfo>> clusterState,
                  java.util.Map<java.lang.String,java.util.Deque<RegionLoad>> loads,
                  org.apache.hadoop.hbase.master.balancer.RegionLocationFinder regionFinder,
                  RackManager rackManager)

Cluster

protected Cluster(java.util.Collection<HRegionInfo> unassignedRegions,
                  java.util.Map<ServerName,java.util.List<HRegionInfo>> clusterState,
                  java.util.Map<java.lang.String,java.util.Deque<RegionLoad>> loads,
                  org.apache.hadoop.hbase.master.balancer.RegionLocationFinder regionFinder,
                  RackManager rackManager)

Method Detail

doAction

public void doAction(BaseLoadBalancer.Cluster.Action action)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object