org.apache.accumulo.master

Class Master

java.lang.Object

org.apache.accumulo.master.Master

All Implemented Interfaces:

LiveTServerSet.Listener, CurrentState, TableObserver

public class Master
extends Object
implements LiveTServerSet.Listener, TableObserver, CurrentState

The Master is responsible for assigning and balancing tablets to tablet servers. The master will also coordinate log recoveries and reports general status.

Method Summary

Methods

Modifier and Type	Method and Description
void	assignedTablet(KeyExtent extent)
void	clearMergeState(org.apache.hadoop.io.Text tableId)
void	clearMigrations(String tableId)
ServerConfiguration	getConfiguration()
LiveTServerSet.TServerConnection	getConnection(TServerInstance server)
Connector	getConnector()
EventCoordinator	getEventCoordinator()
VolumeManager	getFileSystem()
Instance	getInstance()
ZooLock	getMasterLock()
MergeInfo	getMergeInfo(org.apache.hadoop.io.Text tableId)
AccumuloConfiguration	getSystemConfiguration()
boolean	hasCycled(long time)
void	initialize(Map<String,TableState> tableIdToStateMap)
static void	main(String[] args)
Collection<MergeInfo>	merges()
Set<KeyExtent>	migrationsSnapshot()
void	mustBeOnline(String tableId)
Set<String>	onlineTables()
Set<TServerInstance>	onlineTabletServers()
void	run()
void	sessionExpired()
void	setMergeState(MergeInfo info, MergeState state)
void	shutdownTServer(TServerInstance server)
void	stateChanged(String tableId, TableState state)
boolean	stillMaster()
void	update(LiveTServerSet current, Set<TServerInstance> deleted, Set<TServerInstance> added)

Methods inherited from class java.lang.Object

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

Method Detail

stillMaster

public boolean stillMaster()

mustBeOnline

public void mustBeOnline(String tableId)
                  throws ThriftTableOperationException

Throws:

ThriftTableOperationException

getConnector

public Connector getConnector()
                       throws AccumuloException,
                              AccumuloSecurityException

Throws:

AccumuloException

AccumuloSecurityException

getConnection

public LiveTServerSet.TServerConnection getConnection(TServerInstance server)

getMergeInfo

public MergeInfo getMergeInfo(org.apache.hadoop.io.Text tableId)

setMergeState

public void setMergeState(MergeInfo info,
                 MergeState state)
                   throws IOException,
                          org.apache.zookeeper.KeeperException,
                          InterruptedException

Throws:

IOException

org.apache.zookeeper.KeeperException

InterruptedException

clearMergeState

public void clearMergeState(org.apache.hadoop.io.Text tableId)
                     throws IOException,
                            org.apache.zookeeper.KeeperException,
                            InterruptedException

Throws:

IOException

org.apache.zookeeper.KeeperException

InterruptedException

hasCycled

public boolean hasCycled(long time)

clearMigrations

public void clearMigrations(String tableId)

run

public void run()
         throws IOException,
                InterruptedException,
                org.apache.zookeeper.KeeperException

Throws:

IOException

InterruptedException

org.apache.zookeeper.KeeperException

getMasterLock

public ZooLock getMasterLock()

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

update

public void update(LiveTServerSet current,
          Set<TServerInstance> deleted,
          Set<TServerInstance> added)

Specified by:

update in interface LiveTServerSet.Listener

stateChanged

public void stateChanged(String tableId,
                TableState state)

Specified by:

stateChanged in interface TableObserver

initialize

public void initialize(Map<String,TableState> tableIdToStateMap)

Specified by:

initialize in interface TableObserver

sessionExpired

public void sessionExpired()

Specified by:

sessionExpired in interface TableObserver

onlineTables

public Set<String> onlineTables()

Specified by:

onlineTables in interface CurrentState

onlineTabletServers

public Set<TServerInstance> onlineTabletServers()

Specified by:

onlineTabletServers in interface CurrentState

merges

public Collection<MergeInfo> merges()

Specified by:

merges in interface CurrentState

shutdownTServer

public void shutdownTServer(TServerInstance server)

getEventCoordinator

public EventCoordinator getEventCoordinator()

getInstance

public Instance getInstance()

getSystemConfiguration

public AccumuloConfiguration getSystemConfiguration()

getConfiguration

public ServerConfiguration getConfiguration()

getFileSystem

public VolumeManager getFileSystem()

assignedTablet

public void assignedTablet(KeyExtent extent)

migrationsSnapshot

public Set<KeyExtent> migrationsSnapshot()

Specified by:

migrationsSnapshot in interface CurrentState