org.apache.accumulo.server.master.balancer
Class TableLoadBalancer

java.lang.Object
  extended by org.apache.accumulo.server.master.balancer.TabletBalancer
      extended by org.apache.accumulo.server.master.balancer.TableLoadBalancer

public class TableLoadBalancer
extends TabletBalancer


Constructor Summary
TableLoadBalancer()
           
 
Method Summary
 long balance(SortedMap<TServerInstance,TabletServerStatus> current, Set<KeyExtent> migrations, List<TabletMigration> migrationsOut)
          Ask the balancer if any migrations are necessary.
 void getAssignments(SortedMap<TServerInstance,TabletServerStatus> current, Map<KeyExtent,TServerInstance> unassigned, Map<KeyExtent,TServerInstance> assignments)
          Assign tablets to tablet servers.
protected  TabletBalancer getBalancerForTable(String table)
           
protected  String getLoadBalancerClassNameForTable(String table)
           
protected  TableOperations getTableOperations()
           
 
Methods inherited from class org.apache.accumulo.server.master.balancer.TabletBalancer
checkMigrationSanity, getOnlineTabletsForTable
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TableLoadBalancer

public TableLoadBalancer()
Method Detail

getLoadBalancerClassNameForTable

protected String getLoadBalancerClassNameForTable(String table)

getBalancerForTable

protected TabletBalancer getBalancerForTable(String table)

getAssignments

public void getAssignments(SortedMap<TServerInstance,TabletServerStatus> current,
                           Map<KeyExtent,TServerInstance> unassigned,
                           Map<KeyExtent,TServerInstance> assignments)
Description copied from class: TabletBalancer
Assign tablets to tablet servers. This method is called whenever the master finds tablets that are unassigned.

Specified by:
getAssignments in class TabletBalancer
Parameters:
current - The current table-summary state of all the online tablet servers. Read-only. The TabletServerStatus for each server may be null if the tablet server has not yet responded to a recent request for status.
unassigned - A map from unassigned tablet to the last known tablet server. Read-only.
assignments - A map from tablet to assigned server. Write-only.

getTableOperations

protected TableOperations getTableOperations()

balance

public long balance(SortedMap<TServerInstance,TabletServerStatus> current,
                    Set<KeyExtent> migrations,
                    List<TabletMigration> migrationsOut)
Description copied from class: TabletBalancer
Ask the balancer if any migrations are necessary.

Specified by:
balance in class TabletBalancer
Parameters:
current - The current table-summary state of all the online tablet servers. Read-only.
migrations - the current set of migrations. Read-only.
migrationsOut - new migrations to perform; should not contain tablets in the current set of migrations. Write-only.
Returns:
the time, in milliseconds, to wait before re-balancing. This method will not be called when there are unassigned tablets.


Copyright © 2012 The Apache Software Foundation. All Rights Reserved.