org.apache.accumulo.master

Class Master

java.lang.Object

org.apache.accumulo.master.Master

All Implemented Interfaces:

HighlyAvailableService, LiveTServerSet.Listener, CurrentState, TableObserver

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

The Master is responsible for assigning and balancing tablets to tablet servers.

The master will also coordinate log recoveries and reports general status.

Constructor Summary

Constructors

Constructor and Description
Master(ServerContext context)

Method Summary

Modifier and Type	Method and Description
void	assignedTablet(KeyExtent extent)
void	clearMergeState(Table.ID tableId)
void	clearMigrations(Table.ID tableId)
boolean	delegationTokensAvailable() Can delegation tokens be generated for users
AccumuloConfiguration	getConfiguration()
ServerConfigurationFactory	getConfigurationFactory()
LiveTServerSet.TServerConnection	getConnection(TServerInstance server)
ServerContext	getContext()
EventCoordinator	getEventCoordinator()
VolumeManager	getFileSystem()
org.apache.hadoop.fs.FSDataInputStream	getInputStream(String path)
String	getInstanceID()
ZooLock	getMasterLock()
MasterMonitorInfo	getMasterMonitorInfo()
MasterState	getMasterState()
MergeInfo	getMergeInfo(Table.ID tableId)
org.apache.hadoop.fs.FSDataOutputStream	getOutputStream(String path)
Long	getSteadyTime() Return how long (in milliseconds) there has been a master overseeing this cluster.
TableManager	getTableManager()
String	getZooKeeperRoot()
boolean	hasCycled(long time)
void	initialize()
boolean	isActiveService()
static void	main(String[] args)
void	markDeadServerLogsAsClosed(Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)
Collection<MergeInfo>	merges()
Set<KeyExtent>	migrationsSnapshot()
void	mustBeOnline(Table.ID tableId)
Set<Table.ID>	onlineTables()
Set<TServerInstance>	onlineTabletServers()
void	removeBulkImportStatus(String directory)
void	run()
void	sessionExpired()
void	setMergeState(MergeInfo info, MergeState state)
Set<TServerInstance>	shutdownServers()
void	shutdownTServer(TServerInstance server)
void	stateChanged(Table.ID tableId, TableState state)
boolean	stillMaster()
void	update(LiveTServerSet current, Set<TServerInstance> deleted, Set<TServerInstance> added)
void	updateBulkImportStatus(String directory, BulkImportState state)
void	waitForBalance()

Methods inherited from class java.lang.Object

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

Constructor Detail

Master

public Master(ServerContext context)
       throws IOException

Throws:

IOException

Method Detail

getMasterState

public MasterState getMasterState()

Specified by:

getMasterState in interface CurrentState

stillMaster

public boolean stillMaster()

mustBeOnline

public void mustBeOnline(Table.ID tableId)
                  throws ThriftTableOperationException

Throws:

ThriftTableOperationException

getContext

public ServerContext getContext()

getTableManager

public TableManager getTableManager()

getInstanceID

public String getInstanceID()

getZooKeeperRoot

public String getZooKeeperRoot()

getConfiguration

public AccumuloConfiguration getConfiguration()

getConnection

public LiveTServerSet.TServerConnection getConnection(TServerInstance server)

getMergeInfo

public MergeInfo getMergeInfo(Table.ID tableId)

setMergeState

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

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

clearMergeState

public void clearMergeState(Table.ID tableId)
                     throws org.apache.zookeeper.KeeperException,
                            InterruptedException

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

hasCycled

public boolean hasCycled(long time)

clearMigrations

public void clearMigrations(Table.ID 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(Table.ID tableId,
                         TableState state)

Specified by:

stateChanged in interface TableObserver

initialize

public void initialize()

Specified by:

initialize in interface TableObserver

sessionExpired

public void sessionExpired()

Specified by:

sessionExpired in interface TableObserver

onlineTables

public Set<Table.ID> 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()

getConfigurationFactory

public ServerConfigurationFactory getConfigurationFactory()

getFileSystem

public VolumeManager getFileSystem()

assignedTablet

public void assignedTablet(KeyExtent extent)

waitForBalance

public void waitForBalance()

getMasterMonitorInfo

public MasterMonitorInfo getMasterMonitorInfo()

delegationTokensAvailable

public boolean delegationTokensAvailable()

Can delegation tokens be generated for users

migrationsSnapshot

public Set<KeyExtent> migrationsSnapshot()

Specified by:

migrationsSnapshot in interface CurrentState

shutdownServers

public Set<TServerInstance> shutdownServers()

Specified by:

shutdownServers in interface CurrentState

markDeadServerLogsAsClosed

public void markDeadServerLogsAsClosed(Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)
                                throws WalStateManager.WalMarkerException

Throws:

WalStateManager.WalMarkerException

updateBulkImportStatus

public void updateBulkImportStatus(String directory,
                                   BulkImportState state)

removeBulkImportStatus

public void removeBulkImportStatus(String directory)

getSteadyTime

public Long getSteadyTime()

Return how long (in milliseconds) there has been a master overseeing this cluster. This is an approximately monotonic clock, which will be approximately consistent between different masters or different runs of the same master.

isActiveService

public boolean isActiveService()

Specified by:

isActiveService in interface HighlyAvailableService

getOutputStream

public org.apache.hadoop.fs.FSDataOutputStream getOutputStream(String path)
                                                        throws IOException

Throws:

IOException

getInputStream

public org.apache.hadoop.fs.FSDataInputStream getInputStream(String path)
                                                      throws IOException

Throws:

IOException