org.apache.hadoop.hbase.master.balancer

Class FavoredNodeAssignmentHelper

java.lang.Object

org.apache.hadoop.hbase.master.balancer.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(HRegionInfo, List)).

Field Summary

Fields

Modifier and Type	Field and Description
static short	FAVORED_NODES_NUM
static byte[]	FAVOREDNODES_QUALIFIER

Constructor Summary

Constructors

Constructor and Description
FavoredNodeAssignmentHelper(List<ServerName> servers, Configuration conf)

Method Summary

Modifier and Type	Method and Description
static byte[]	getFavoredNodes(List<ServerName> serverAddrList)
static String	getFavoredNodesAsString(List<ServerName> nodes)
static ServerName[]	getFavoredNodesList(byte[] favoredNodes)
void	initialize()
Map<HRegionInfo,ServerName[]>	placeSecondaryAndTertiaryWithRestrictions(Map<HRegionInfo,ServerName> primaryRSMap) For regions that share the primary, avoid placing the secondary and tertiary on a same RS.
static void	updateMetaWithFavoredNodesInfo(Map<HRegionInfo,List<ServerName>> regionToFavoredNodes, Configuration conf) Update meta table with favored nodes info
static void	updateMetaWithFavoredNodesInfo(Map<HRegionInfo,List<ServerName>> regionToFavoredNodes, Connection connection) Update meta table with favored nodes info

Methods inherited from class java.lang.Object

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

Field Detail

FAVOREDNODES_QUALIFIER

public static final byte[] FAVOREDNODES_QUALIFIER

FAVORED_NODES_NUM

public static final short FAVORED_NODES_NUM

See Also:

Constant Field Values

Constructor Detail

FavoredNodeAssignmentHelper

public FavoredNodeAssignmentHelper(List<ServerName> servers,
                                   Configuration conf)

Method Detail

updateMetaWithFavoredNodesInfo

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

Update meta table with favored nodes info

Parameters:

regionToFavoredNodes - map of HRegionInfo's to their favored nodes

connection - connection to be used

Throws:

IOException

updateMetaWithFavoredNodesInfo

public static void updateMetaWithFavoredNodesInfo(Map<HRegionInfo,List<ServerName>> regionToFavoredNodes,
                                                  Configuration conf)
                                           throws IOException

Update meta table with favored nodes info

Parameters:

regionToFavoredNodes -

conf -

Throws:

IOException

getFavoredNodesList

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

Parameters:

favoredNodes - The PB'ed bytes of favored nodes

Returns:

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

Throws:

InvalidProtocolBufferException

getFavoredNodes

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

Parameters:

serverAddrList -

Returns:

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

placeSecondaryAndTertiaryWithRestrictions

public Map<HRegionInfo,ServerName[]> placeSecondaryAndTertiaryWithRestrictions(Map<HRegionInfo,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

Parameters:

primaryRSMap -

Returns:

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

initialize

public void initialize()

getFavoredNodesAsString

public static String getFavoredNodesAsString(List<ServerName> nodes)