org.apache.hadoop.hbase.favored

类 FavoredNodeAssignmentHelper

java.lang.Object

org.apache.hadoop.hbase.favored.FavoredNodeAssignmentHelper

@InterfaceAudience.Private
public class FavoredNodeAssignmentHelper
extends Object

Helper class for FavoredNodeLoadBalancer that has all the intelligence for racks, meta scans, etc. Instantiated by the FavoredNodeLoadBalancer when needed (from within calls like FavoredNodeLoadBalancer.randomAssignment(RegionInfo, List)). All updates to favored nodes should only be done from FavoredNodesManager and not through this helper class (except for tests).

字段概要

字段

限定符和类型	字段和说明
static short	FAVORED_NODES_NUM
static byte[]	FAVOREDNODES_QUALIFIER
static short	MAX_ATTEMPTS_FN_GENERATION

构造器概要

构造器

构造器和说明
FavoredNodeAssignmentHelper(List<ServerName> servers, org.apache.hadoop.conf.Configuration conf)
FavoredNodeAssignmentHelper(List<ServerName> servers, RackManager rackManager)

方法概要

限定符和类型	方法和说明
boolean	canPlaceFavoredNodes()
List<ServerName>	generateFavoredNodes(RegionInfo hri)
Map<RegionInfo,List<ServerName>>	generateFavoredNodesRoundRobin(Map<ServerName,List<RegionInfo>> assignmentMap, List<RegionInfo> regions)
ServerName	generateMissingFavoredNode(List<ServerName> favoredNodes)
ServerName	generateMissingFavoredNode(List<ServerName> favoredNodes, List<ServerName> excludeNodes)
static byte[]	getFavoredNodes(List<ServerName> serverAddrList)
static String	getFavoredNodesAsString(List<ServerName> nodes)
static ServerName[]	getFavoredNodesList(byte[] favoredNodes)
protected String	getOneRandomRack(Set<String> skipRackSet)
protected ServerName	getOneRandomServer(String rack, Set<ServerName> skipServerSet) Gets a random server from the specified rack and skips anything specified.
ServerName[]	getSecondaryAndTertiary(RegionInfo regionInfo, ServerName primaryRS)
void	initialize()
void	placePrimaryRSAsRoundRobin(Map<ServerName,List<RegionInfo>> assignmentMap, Map<RegionInfo,ServerName> primaryRSMap, List<RegionInfo> regions)
Map<RegionInfo,ServerName[]>	placeSecondaryAndTertiaryRS(Map<RegionInfo,ServerName> primaryRSMap)
Map<RegionInfo,ServerName[]>	placeSecondaryAndTertiaryWithRestrictions(Map<RegionInfo,ServerName> primaryRSMap) For regions that share the primary, avoid placing the secondary and tertiary on a same RS.
static void	updateMetaWithFavoredNodesInfo(Map<RegionInfo,List<ServerName>> regionToFavoredNodes, org.apache.hadoop.conf.Configuration conf) Update meta table with favored nodes info
static void	updateMetaWithFavoredNodesInfo(Map<RegionInfo,List<ServerName>> regionToFavoredNodes, Connection connection) Update meta table with favored nodes info

从类继承的方法 java.lang.Object

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

字段详细资料

FAVOREDNODES_QUALIFIER

public static final byte[] FAVOREDNODES_QUALIFIER

FAVORED_NODES_NUM

public static final short FAVORED_NODES_NUM

另请参阅:

常量字段值

MAX_ATTEMPTS_FN_GENERATION

public static final short MAX_ATTEMPTS_FN_GENERATION

另请参阅:

常量字段值

构造器详细资料

FavoredNodeAssignmentHelper

public FavoredNodeAssignmentHelper(List<ServerName> servers,
                                   org.apache.hadoop.conf.Configuration conf)

FavoredNodeAssignmentHelper

public FavoredNodeAssignmentHelper(List<ServerName> servers,
                                   RackManager rackManager)

方法详细资料

initialize

public void initialize()

updateMetaWithFavoredNodesInfo

public static void updateMetaWithFavoredNodesInfo(Map<RegionInfo,List<ServerName>> regionToFavoredNodes,
                                                  Connection connection)
                                           throws IOException

Update meta table with favored nodes info

参数:

regionToFavoredNodes - map of RegionInfo's to their favored nodes

connection - connection to be used

抛出:

IOException

updateMetaWithFavoredNodesInfo

public static void updateMetaWithFavoredNodesInfo(Map<RegionInfo,List<ServerName>> regionToFavoredNodes,
                                                  org.apache.hadoop.conf.Configuration conf)
                                           throws IOException

Update meta table with favored nodes info

参数:

regionToFavoredNodes -

conf -

抛出:

IOException

getFavoredNodesList

public static ServerName[] getFavoredNodesList(byte[] favoredNodes)
                                        throws IOException

参数:

favoredNodes - The PB'ed bytes of favored nodes

返回:

the array of ServerName for the byte array of favored nodes.

抛出:

IOException

getFavoredNodes

public static byte[] getFavoredNodes(List<ServerName> serverAddrList)

参数:

serverAddrList -

返回:

PB'ed bytes of HBaseProtos.FavoredNodes generated by the server list.

placePrimaryRSAsRoundRobin

public void placePrimaryRSAsRoundRobin(Map<ServerName,List<RegionInfo>> assignmentMap,
                                       Map<RegionInfo,ServerName> primaryRSMap,
                                       List<RegionInfo> regions)

placeSecondaryAndTertiaryRS

public Map<RegionInfo,ServerName[]> placeSecondaryAndTertiaryRS(Map<RegionInfo,ServerName> primaryRSMap)

getSecondaryAndTertiary

public ServerName[] getSecondaryAndTertiary(RegionInfo regionInfo,
                                            ServerName primaryRS)
                                     throws IOException

抛出:

IOException

placeSecondaryAndTertiaryWithRestrictions

public Map<RegionInfo,ServerName[]> placeSecondaryAndTertiaryWithRestrictions(Map<RegionInfo,ServerName> primaryRSMap)

For regions that share the primary, avoid placing the secondary and tertiary on a same RS. Used for generating new assignments for the primary/secondary/tertiary RegionServers

参数:

primaryRSMap -

返回:

the map of regions to the servers the region-files should be hosted on

canPlaceFavoredNodes

public boolean canPlaceFavoredNodes()

getOneRandomServer

protected ServerName getOneRandomServer(String rack,
                                        Set<ServerName> skipServerSet)

Gets a random server from the specified rack and skips anything specified.

参数:

rack - rack from a server is needed

skipServerSet - the server shouldn't belong to this set

getOneRandomRack

protected String getOneRandomRack(Set<String> skipRackSet)
                           throws IOException

抛出:

IOException

getFavoredNodesAsString

public static String getFavoredNodesAsString(List<ServerName> nodes)

generateMissingFavoredNode

public ServerName generateMissingFavoredNode(List<ServerName> favoredNodes)
                                      throws IOException

抛出:

IOException

generateMissingFavoredNode

public ServerName generateMissingFavoredNode(List<ServerName> favoredNodes,
                                             List<ServerName> excludeNodes)
                                      throws IOException

抛出:

IOException

generateFavoredNodes

public List<ServerName> generateFavoredNodes(RegionInfo hri)
                                      throws IOException

抛出:

IOException

generateFavoredNodesRoundRobin

public Map<RegionInfo,List<ServerName>> generateFavoredNodesRoundRobin(Map<ServerName,List<RegionInfo>> assignmentMap,
                                                                       List<RegionInfo> regions)
                                                                throws IOException

抛出:

IOException