Field Detail

• BOGUS_SERVER_NAME

  static final ServerName BOGUS_SERVER_NAME

Method Detail

• setClusterStatus

  void setClusterStatus(ClusterStatus st)

  Set the current cluster status. This allows a LoadBalancer to map host name to a server

  Parameters:

  st -

• setMasterServices

  void setMasterServices(MasterServices masterServices)

  Set the master service.

  Parameters:

  masterServices -

• balanceCluster

  List<RegionPlan> balanceCluster(TableName tableName,
                                Map<ServerName,List<HRegionInfo>> clusterState)
                                  throws HBaseIOException

  Perform the major balance operation

  Parameters:

  tableName -

  clusterState -

  Returns:

  List of plans

  Throws:

  HBaseIOException

• balanceCluster

  List<RegionPlan> balanceCluster(Map<ServerName,List<HRegionInfo>> clusterState)
                                  throws HBaseIOException

  Perform the major balance operation

  Parameters:

  clusterState -

  Returns:

  List of plans

  Throws:

  HBaseIOException

• roundRobinAssignment

  Map<ServerName,List<HRegionInfo>> roundRobinAssignment(List<HRegionInfo> regions,
                                                       List<ServerName> servers)
                                                         throws HBaseIOException

  Perform a Round Robin assignment of regions.

  Parameters:

  regions -

  servers -

  Returns:

  Map of servername to regioninfos

  Throws:

  HBaseIOException

• retainAssignment

  Map<ServerName,List<HRegionInfo>> retainAssignment(Map<HRegionInfo,ServerName> regions,
                                                   List<ServerName> servers)
                                                     throws HBaseIOException

  Assign regions to the previously hosting region server

  Parameters:

  regions -

  servers -

  Returns:

  List of plans

  Throws:

  HBaseIOException

• immediateAssignment

  Map<HRegionInfo,ServerName> immediateAssignment(List<HRegionInfo> regions,
                                                List<ServerName> servers)
                                                  throws HBaseIOException

  Sync assign a region

  Parameters:

  regions -

  servers -

  Returns:

  Map regioninfos to servernames

  Throws:

  HBaseIOException

• randomAssignment

  ServerName randomAssignment(HRegionInfo regionInfo,
                            List<ServerName> servers)
                              throws HBaseIOException

  Get a random region server from the list

  Parameters:

  regionInfo - Region for which this selection is being done.

  servers -

  Returns:

  Servername

  Throws:

  HBaseIOException

• initialize

  void initialize()
                  throws HBaseIOException

  Initialize the load balancer. Must be called after setters.

  Throws:

  HBaseIOException

• regionOnline

  void regionOnline(HRegionInfo regionInfo,
                  ServerName sn)

  Marks the region as online at balancer.

  Parameters:

  regionInfo -

  sn -

• regionOffline

  void regionOffline(HRegionInfo regionInfo)

  Marks the region as offline at balancer.

  Parameters:

  regionInfo -

• onConfigurationChange

  void onConfigurationChange(org.apache.hadoop.conf.Configuration conf)

  Description copied from interface: ConfigurationObserver
  This method would be called by the ConfigurationManager object when the Configuration object is reloaded from disk.

  Specified by:

  onConfigurationChange in interface ConfigurationObserver

• postMasterStartupInitialize

  void postMasterStartupInitialize()

  If balancer needs to do initialization after Master has started up, lets do that here.

• updateBalancerStatus

  void updateBalancerStatus(boolean status)