Package org.apache.hadoop.hbase.favored

Class FavoredNodesPlan

java.lang.Object

org.apache.hadoop.hbase.favored.FavoredNodesPlan

@Private
public class FavoredNodesPlan
extends Object

This class contains the mapping information between each region name 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	Description
static enum	FavoredNodesPlan.Position

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<String,List<ServerName>>	favoredNodesMap	The map between each region name and its favored region server list

Constructor Summary

Constructors

Constructor	Description
FavoredNodesPlan()

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
Map<String,List<ServerName>>	getAssignmentMap()	Return the mapping between each region to its favored region server list.
List<ServerName>	getFavoredNodes(RegionInfo region)	Returns the list of favored region server for this region based on the plan
static FavoredNodesPlan.Position	getFavoredServerPosition(List<ServerName> favoredNodes, ServerName server)	Return the position of the server in the favoredNodes list.
int	hashCode()
(package private) List<ServerName>	removeFavoredNodes(RegionInfo region)	Remove a favored node assignment
int	size()
void	updateFavoredNodesMap(RegionInfo region, List<ServerName> servers)	Update an assignment to the plan
(package private) void	updateFavoredNodesMap(FavoredNodesPlan fnp)	Add to existing Map of FavoredNodes.

Methods inherited from class java.lang.Object

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

Field Details

favoredNodesMap

private final Map<String,List<ServerName>> favoredNodesMap

The map between each region name and its favored region server list

Constructor Details

FavoredNodesPlan

public FavoredNodesPlan()

Method Details

updateFavoredNodesMap

void updateFavoredNodesMap(FavoredNodesPlan fnp)

Add to existing Map of FavoredNodes.

updateFavoredNodesMap

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

Update an assignment to the plan

removeFavoredNodes

List<ServerName> removeFavoredNodes(RegionInfo region)

Remove a favored node assignment

Returns:

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

getFavoredNodes

public List<ServerName> getFavoredNodes(RegionInfo 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.

getAssignmentMap

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

Return the mapping between each region to its favored region server list.

size

public int size()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object