org.apache.hadoop.hbase.favored

Class FavoredNodesPlan

java.lang.Object

org.apache.hadoop.hbase.favored.FavoredNodesPlan

@InterfaceAudience.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 and Description
static class	FavoredNodesPlan.Position

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
FavoredNodesPlan()

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
Map<String,List<ServerName>>	getAssignmentMap()
List<ServerName>	getFavoredNodes(RegionInfo region)
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()
(package private) void	updateFavoredNodesMap(FavoredNodesPlan fnp) Add to existing Map of FavoredNodes.
void	updateFavoredNodesMap(RegionInfo region, List<ServerName> servers) Update an assignment to the plan

Methods inherited from class java.lang.Object

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

Field Detail

favoredNodesMap

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

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

Constructor Detail

FavoredNodesPlan

public FavoredNodesPlan()

Method Detail

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.

Returns:

position

getAssignmentMap

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

Returns:

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