Package org.apache.accumulo.master

Class Master

java.lang.Object

org.apache.accumulo.core.client.impl.ClientContext

org.apache.accumulo.server.AccumuloServerContext

org.apache.accumulo.master.Master

All Implemented Interfaces:

LiveTServerSet.Listener, CurrentState, TableObserver

public class Master
extends AccumuloServerContext
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.

Field Summary

Fields inherited from class org.apache.accumulo.core.client.impl.ClientContext

conn, inst

Constructor Summary

Constructors

Constructor	Description
Master(ServerConfigurationFactory config, VolumeManager fs, String hostname)

Method Summary

Modifier and Type	Method	Description
void	assignedTablet(KeyExtent extent)
void	clearMergeState(String tableId)
void	clearMigrations(String tableId)
boolean	delegationTokensAvailable()	Can delegation tokens be generated for users
ServerConfigurationFactory	getConfigurationFactory()
LiveTServerSet.TServerConnection	getConnection(TServerInstance server)
EventCoordinator	getEventCoordinator()
VolumeManager	getFileSystem()
ZooLock	getMasterLock()
MasterMonitorInfo	getMasterMonitorInfo()
MasterState	getMasterState()
MergeInfo	getMergeInfo(String tableId)
Long	getSteadyTime()	Return how long (in milliseconds) there has been a master overseeing this cluster.
boolean	hasCycled(long time)
void	initialize(Map<String,TableState> tableIdToStateMap)
static void	main(String[] args)
void	markDeadServerLogsAsClosed(Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)
Collection<MergeInfo>	merges()
Set<KeyExtent>	migrationsSnapshot()
void	mustBeOnline(String tableId)
Set<String>	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(String tableId, TableState state)
boolean	stillMaster()
void	update(LiveTServerSet current, Set<TServerInstance> deleted, Set<TServerInstance> added)
void	updateBulkImportStatus(String directory, BulkImportState state)
void	waitForBalance(TInfo tinfo)

Methods inherited from class org.apache.accumulo.server.AccumuloServerContext

getConnector, getSaslParams, getSecretManager, getServerConfigurationFactory, getServerSslParams, getThriftServerType, setSecretManager

Methods inherited from class org.apache.accumulo.core.client.impl.ClientContext

convertClientConfig, getClientSslParams, getClientTimeoutInMillis, getConfiguration, getCredentials, getInstance, rpcCreds, setCredentials

Methods inherited from class java.lang.Object

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

Constructor Detail

Master

public Master(ServerConfigurationFactory config,
              VolumeManager fs,
              String hostname)
       throws IOException

Throws:

IOException

Method Detail

getMasterState

public MasterState getMasterState()

Specified by:

getMasterState in interface CurrentState

stillMaster

public boolean stillMaster()

mustBeOnline

public void mustBeOnline(String tableId)
                  throws ThriftTableOperationException

Throws:

ThriftTableOperationException

getConnection

public LiveTServerSet.TServerConnection getConnection(TServerInstance server)

getMergeInfo

public MergeInfo getMergeInfo(String 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(String 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()

getConfigurationFactory

public ServerConfigurationFactory getConfigurationFactory()

getFileSystem

public VolumeManager getFileSystem()

assignedTablet

public void assignedTablet(KeyExtent extent)

waitForBalance

public void waitForBalance(TInfo tinfo)

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.