org.apache.hadoop.hbase.master.balancer

Class FavoredNodesPlan

java.lang.Object

org.apache.hadoop.hbase.master.balancer.FavoredNodesPlan

@InterfaceAudience.Private
public class FavoredNodesPlan
extends Object

This class contains the mapping information between each region and its favored region server list. Used by FavoredNodeLoadBalancer set of classes and from unit tests (hence the class is public) All the access to this class is thread-safe.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FavoredNodesPlan.Position

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.commons.logging.Log	LOG

Constructor Summary

Constructors

Constructor and Description
FavoredNodesPlan()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
Map<HRegionInfo,List<ServerName>>	getAssignmentMap()
List<ServerName>	getFavoredNodes(HRegionInfo region)
static FavoredNodesPlan.Position	getFavoredServerPosition(List<ServerName> favoredNodes, ServerName server) Return the position of the server in the favoredNodes list.
int	hashCode()
void	updateAssignmentPlan(HRegionInfo region, List<ServerName> servers) Add an assignment to the plan
void	updateFavoredNodesMap(HRegionInfo region, List<ServerName> servers) Add an assignment to the plan

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected static final org.apache.commons.logging.Log LOG

Constructor Detail

FavoredNodesPlan

public FavoredNodesPlan()

Method Detail

updateFavoredNodesMap

public void updateFavoredNodesMap(HRegionInfo region,
                         List<ServerName> servers)

Add an assignment to the plan

Parameters:

region -

servers -

getFavoredNodes

public List<ServerName> getFavoredNodes(HRegionInfo region)

Parameters:

region -

Returns:

the list of favored region server for this region based on the plan

getFavoredServerPosition

public static FavoredNodesPlan.Position getFavoredServerPosition(List<ServerName> favoredNodes,
                                                 ServerName server)

Return the position of the server in the favoredNodes list. Assumes the favoredNodes list is of size 3.

Parameters:

favoredNodes -

server -

Returns:

position

getAssignmentMap

public Map<HRegionInfo,List<ServerName>> getAssignmentMap()

Returns:

the mapping between each region to its favored region server list

updateAssignmentPlan

public void updateAssignmentPlan(HRegionInfo region,
                        List<ServerName> servers)

Add an assignment to the plan

Parameters:

region -

servers -

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object