HMaster (Apache HBase - Server 1.4.14 API)

java.lang.Object
- org.apache.hadoop.hbase.util.HasThread
- - org.apache.hadoop.hbase.regionserver.HRegionServer
  - - org.apache.hadoop.hbase.master.HMaster

所有已实现的接口:

Runnable, Abortable, ConfigurationObserver, MasterServices, FavoredNodesForRegion, LastSequenceId, OnlineRegions, RegionServerServices, Server, Stoppable

直接已知子类:

HMasterCommandLine.LocalHMaster
```
@InterfaceAudience.LimitedPrivate(value="Tools")
public class HMaster
extends HRegionServer
implements MasterServices, Server
```
HMaster is the "master server" for HBase. An HBase cluster has one active master. If many masters are started, all compete. Whichever wins goes on to run the cluster. All others park themselves in their constructor until master or cluster shutdown or until the active master loses its lease in zookeeper. Thereafter, all running master jostle to take over master role.
The Master can be asked shutdown the cluster. See shutdown(). In this case it will tell all regionservers to go down and then wait on them all reporting in that they are down. This master will then shut itself down.
You can also shutdown just this master. Call stopMaster().

另请参阅:
Watcher

嵌套类概要

嵌套类
限定符和类型类和说明

static class HMaster.RedirectServlet
- 从类继承的嵌套类/接口 org.apache.hadoop.hbase.regionserver.HRegionServer
  HRegionServer.MovedRegionsCleaner
- 从接口继承的嵌套类/接口 org.apache.hadoop.hbase.regionserver.RegionServerServices
  RegionServerServices.PostOpenDeployContext, RegionServerServices.RegionStateTransitionContext

嵌套类
限定符和类型	类和说明
`static class`	`HMaster.RedirectServlet`

字段概要

字段
限定符和类型字段和说明

static String MASTER
- 从类继承的字段 org.apache.hadoop.hbase.regionserver.HRegionServer
  cacheConfig, cacheFlusher, CLOSE, clusterConnection, clusterStatusTracker, compactSplitThread, conf, configurationManager, csm, fs, fsOk, hMemManager, infoServer, initLatch, leases, lock, MASTER_HOSTNAME_KEY, metaTableLocator, movedRegions, msgInterval, numRegionsToReport, onlineRegions, OPEN, recoveringRegions, regionFavoredNodesMap, REGIONSERVER, regionsInTransitionInRS, replicationSinkHandler, replicationSourceHandler, rpcServices, serverName, service, sleeper, startcode, tableDescriptors, tableLockManager, threadWakeFrequency, useThisHostnameInstead, walFactory, walFs, zooKeeper

字段
限定符和类型	字段和说明
`static String`	`MASTER`

构造器概要

构造器
构造器和说明

HMaster(org.apache.hadoop.conf.Configuration conf, CoordinatedStateManager csm)
Initializes the HMaster.

构造器
构造器和说明
`HMaster(org.apache.hadoop.conf.Configuration conf, CoordinatedStateManager csm)` Initializes the HMaster.

方法概要

方法
限定符和类型	方法和说明
`void`	`abort(String msg, Throwable t)` Cause the server to exit without closing the regions it is serving, the log it is using and without notifying the master.
`boolean`	`abortProcedure(long procId, boolean mayInterruptIfRunning)` Abort a procedure.
`void`	`addColumn(TableName tableName, HColumnDescriptor columnDescriptor, long nonceGroup, long nonce)` Add a new column to an existing table
`boolean`	`balance()`
`boolean`	`balance(boolean force)`
`boolean`	`balanceSwitch(boolean b)`
`protected boolean`	`canCreateBaseZNode()`
`protected boolean`	`canUpdateTableDescriptor()`
`void`	`checkIfShouldMoveSystemRegionAsync()`
`void`	`checkTableModifiable(TableName tableName)` Check table is modifiable; i.e. exists and is offline.
`protected void`	`configureInfoServer()`
`static HMaster`	`constructMaster(Class<? extends HMaster> masterClass, org.apache.hadoop.conf.Configuration conf, CoordinatedStateManager cp)` Utility for constructing an instance of the passed HMaster class.
`void`	`createNamespace(NamespaceDescriptor descriptor, long nonceGroup, long nonce)` Create a new namespace
`void`	`createNamespaceSync(NamespaceDescriptor descriptor, long nonceGroup, long nonce, boolean executeCoprocessor)` Create a new namespace synchronously.
`protected RSRpcServices`	`createRpcServices()`
`long`	`createSystemTable(HTableDescriptor hTableDescriptor)` Create a system table using the given table definition.
`long`	`createTable(HTableDescriptor hTableDescriptor, byte[][] splitKeys, long nonceGroup, long nonce)` Create a table using the given table definition.
`void`	`deleteColumn(TableName tableName, byte[] columnName, long nonceGroup, long nonce)` Delete a column from an existing table
`void`	`deleteNamespace(String name, long nonceGroup, long nonce)` Delete an existing namespace.
`long`	`deleteTable(TableName tableName, long nonceGroup, long nonce)` Delete a table
`long`	`disableTable(TableName tableName, long nonceGroup, long nonce)` Disable an existing table
`void`	`dispatchMergingRegions(HRegionInfo region_a, HRegionInfo region_b, boolean forcible, User user)` Merge two regions.
`long`	`enableTable(TableName tableName, long nonceGroup, long nonce)` Enable an existing table
`protected void`	`ensureNamespaceExists(String name)` Ensure that the specified namespace exists, otherwise throws a NamespaceNotFoundException
`AssignmentManager`	`getAssignmentManager()`
`double`	`getAverageLoad()` Compute the average load across all region servers.
`ClusterStatus`	`getClusterStatus()`
`ClusterStatus`	`getClusterStatusWithoutCoprocessor()`
`protected Class<? extends javax.servlet.http.HttpServlet>`	`getDumpServlet()`
`HFileCleaner`	`getHFileCleaner()`
`MasterProcedureScheduler.ProcedureEvent`	`getInitializedEvent()`
`long`	`getLastMajorCompactionTimestamp(TableName table)`
`long`	`getLastMajorCompactionTimestampForRegion(byte[] regionName)`
`LoadBalancer`	`getLoadBalancer()`
`String`	`getLoadBalancerClassName()` Fetch the configured `LoadBalancer` class name.
`static String`	`getLoadedCoprocessors()` The set of loaded coprocessors is stored in a static set.
`LogCleaner`	`getLogCleaner()`
`long`	`getMasterActiveTime()`
`MasterCoprocessorHost`	`getMasterCoprocessorHost()`
`String[]`	`getMasterCoprocessors()`
`MasterFileSystem`	`getMasterFileSystem()`
`long`	`getMasterFinishedInitializationTime()`
`ProcedureExecutor<MasterProcedureEnv>`	`getMasterProcedureExecutor()`
`MasterProcedureManagerHost`	`getMasterProcedureManagerHost()`
`MasterQuotaManager`	`getMasterQuotaManager()`
`MasterRpcServices`	`getMasterRpcServices()`
`long`	`getMasterStartTime()`
`long`	`getMergePlanCount()`
`NamespaceDescriptor`	`getNamespaceDescriptor(String name)` Get a namespace descriptor by name
`int`	`getNumWALFiles()`
`protected String`	`getProcessName()`
`RegionNormalizerTracker`	`getRegionNormalizerTracker()`
`MemoryBoundedLogMessageBuffer`	`getRegionServerFatalLogBuffer()`
`int`	`getRegionServerInfoPort(ServerName sn)`
`String`	`getRegionServerVersion(ServerName sn)`
`MasterProcedureScheduler.ProcedureEvent`	`getServerCrashProcessingEnabledEvent()`
`ServerManager`	`getServerManager()`
`ServerName`	`getServerName()`
`SnapshotManager`	`getSnapshotManager()`
`SplitOrMergeTracker`	`getSplitOrMergeTracker()`
`long`	`getSplitPlanCount()`
`TableDescriptors`	`getTableDescriptors()`
`TableNamespaceManager`	`getTableNamespaceManager()`
`WALProcedureStore`	`getWalProcedureStore()`
`ZooKeeperWatcher`	`getZooKeeper()` Gets the ZooKeeper instance for this server.
`boolean`	`isActiveMaster()` Report whether this master is currently the active master or not.
`boolean`	`isBalancerOn()` Queries the state of the `LoadBalancerTracker`.
`boolean`	`isInitializationStartsMetaRegionAssignment()` Report whether this master has started initialization and is about to do meta region assignment
`boolean`	`isInitialized()` Report whether this master has completed with its initialization and is ready.
`boolean`	`isInMaintenanceMode()` Report whether this master is in maintenance mode.
`boolean`	`isNormalizerOn()` Queries the state of the `RegionNormalizerTracker`.
`boolean`	`isServerCrashProcessingEnabled()` ServerCrashProcessingEnabled is set false before completing assignMeta to prevent processing of crashed servers.
`boolean`	`isSplitOrMergeEnabled(Admin.MasterSwitchType switchType)` Queries the state of the `SplitOrMergeTracker`.
`List<NamespaceDescriptor>`	`listNamespaceDescriptors()` List available namespace descriptors
`List<ProcedureInfo>`	`listProcedures()` List procedures
`List<HTableDescriptor>`	`listTableDescriptors(String namespace, String regex, List<TableName> tableNameList, boolean includeSysTables)` Returns the list of table descriptors that match the specified request
`List<HTableDescriptor>`	`listTableDescriptorsByNamespace(String name)` Get list of table descriptors by namespace
`List<TableName>`	`listTableNames(String namespace, String regex, boolean includeSysTables)` Returns the list of table names that match the specified request
`List<TableName>`	`listTableNamesByNamespace(String name)` Get list of table names by namespace
`protected void`	`login(UserProvider user, String host)` For compatibility, if failed with regionserver credentials, try the master one
`static void`	`main(String[] args)`
`void`	`modifyColumn(TableName tableName, HColumnDescriptor descriptor, long nonceGroup, long nonce)` Modify the column descriptor of an existing column in an existing table
`void`	`modifyNamespace(NamespaceDescriptor descriptor, long nonceGroup, long nonce)` Modify an existing namespace
`void`	`modifyTable(TableName tableName, HTableDescriptor descriptor, long nonceGroup, long nonce)` Modify the descriptor of an existing table
`void`	`move(byte[] encodedRegionName, byte[] destServerName)`
`boolean`	`normalizeRegions()` Perform normalization of cluster (invoked by `RegionNormalizerChore`).
`boolean`	`registerService(com.google.protobuf.Service instance)` Registers a new protocol buffer `Service` subclass as a coprocessor endpoint to be available for handling
`protected void`	`sendShutdownInterrupt()` Called on stop/abort before closing the cluster connection and meta locator.
`void`	`setCatalogJanitorEnabled(boolean b)` Switch for the background CatalogJanitor thread.
`void`	`setInitialized(boolean isInitialized)`
`void`	`setServerCrashProcessingEnabled(boolean b)`
`void`	`shutdown()`
`void`	`stopMaster()`
`protected void`	`stopServiceThreads()` Wait on all threads to finish.
`void`	`truncateTable(TableName tableName, boolean preserveSplits, long nonceGroup, long nonce)` Truncate a table
`protected void`	`waitForMasterActive()` If configured to put regions on active master, wait till a backup master becomes active.

从类继承的方法 org.apache.hadoop.hbase.regionserver.HRegionServer
abort, addToMovedRegions, addToOnlineRegions, checkFileSystem, cleanMovedRegions, closeAllRegions, closeRegion, constructRegionServer, convertThrowableToIOE, createClusterConnection, createRegionLoad, createRegionServerStatusStub, createRegionServerStatusStub, ensureMetaWALRoller, execRegionServerService, getCacheConfig, getChoreService, getClusterId, getCompactionPressure, getCompactionRequester, getCompactSplitThread, getConfiguration, getConfigurationManager, getConnection, getCoordinatedStateManager, getExecutorService, getFavoredNodesForRegion, getFileSystem, getFlushPressure, getFlushRequester, getFlushThroughputController, getFromOnlineRegions, getHeapMemoryManager, getInfoServer, getLastSequenceId, getLeases, getMasterAddressTracker, getMetaTableLocator, getMetrics, getNonceManager, getNumberOfOnlineRegions, getOnlineRegion, getOnlineRegions, getOnlineRegions, getOnlineRegionsLocalContext, getOnlineTables, getRecoveringRegions, getRegion, getRegionBlockLocations, getRegionByEncodedName, getRegionByEncodedName, getRegionServerAccounting, getRegionServerCoprocessorHost, getRegionServerCoprocessors, getRegionServerMetrics, getRegionServerQuotaManager, getRegionsInTransitionInRS, getReplicationSourceService, getRootDir, getRpcServer, getRSRpcServices, getStartcode, getTableLockManager, getThreadWakeFrequency, getWAL, getWALFileSystem, getWALRootDir, getWALs, handleReportForDutyResponse, isAborted, isOnline, isStopped, isStopping, kill, movedRegionCleanerPeriod, onConfigurationChange, postOpenDeployTasks, postOpenDeployTasks, removeFromOnlineRegions, reportRegionStateTransition, reportRegionStateTransition, reportRegionStateTransition, run, setInitLatch, setupClusterConnection, shouldUseThisHostnameInstead, stop, stop, toString, tryRegionServerReport, unassign, updateConfiguration, updateRegionFavoredNodesMapping, waitForServerOnline, walRollRequestFinished

从类继承的方法 org.apache.hadoop.hbase.util.HasThread
getName, getThread, interrupt, isAlive, isInterrupted, join, join, join, setDaemon, setName, setPriority, setUncaughtExceptionHandler, start

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

从接口继承的方法 org.apache.hadoop.hbase.master.MasterServices
getExecutorService, getTableLockManager

从接口继承的方法 org.apache.hadoop.hbase.Server
getChoreService, getConfiguration, getConnection, getCoordinatedStateManager, getMetaTableLocator

从接口继承的方法 org.apache.hadoop.hbase.Abortable
isAborted

从接口继承的方法 org.apache.hadoop.hbase.Stoppable
isStopped, stop

- 字段详细资料
  - MASTER
```
public static final String MASTER
```
    另请参阅:
    常量字段值
- 构造器详细资料
  - HMaster
```
public HMaster(org.apache.hadoop.conf.Configuration conf,
       CoordinatedStateManager csm)
        throws IOException,
               org.apache.zookeeper.KeeperException,
               InterruptedException
```
    Initializes the HMaster. The steps are as follows:
    1. Initialize the local HRegionServer
    2. Start the ActiveMasterManager.
    Remaining steps of initialization occur in #finishActiveMasterInitialization(MonitoredTask) after the master becomes the active one.
    抛出:
    
    InterruptedException
    
    org.apache.zookeeper.KeeperException
    
    IOException
- 方法详细资料
  - login
```
protected void login(UserProvider user,
         String host)
              throws IOException
```
    For compatibility, if failed with regionserver credentials, try the master one
    
    覆盖:
    
    login 在类中 HRegionServer
    
    抛出:
    
    IOException
  - waitForMasterActive
```
protected void waitForMasterActive()
```
    If configured to put regions on active master, wait till a backup master becomes active. Otherwise, loop till the server is stopped or aborted.
    
    覆盖:
    
    waitForMasterActive 在类中 HRegionServer
  - getMasterRpcServices
```
public MasterRpcServices getMasterRpcServices()
```
  - balanceSwitch
```
public boolean balanceSwitch(boolean b)
                      throws IOException
```
    抛出:
    
    IOException
  - getProcessName
```
protected String getProcessName()
```
    覆盖:
    
    getProcessName 在类中 HRegionServer
  - canCreateBaseZNode
```
protected boolean canCreateBaseZNode()
```
    覆盖:
    
    canCreateBaseZNode 在类中 HRegionServer
  - canUpdateTableDescriptor
```
protected boolean canUpdateTableDescriptor()
```
    覆盖:
    
    canUpdateTableDescriptor 在类中 HRegionServer
  - createRpcServices
```
protected RSRpcServices createRpcServices()
                                   throws IOException
```
    覆盖:
    
    createRpcServices 在类中 HRegionServer
    
    抛出:
    
    IOException
  - configureInfoServer
```
protected void configureInfoServer()
```
    覆盖:
    
    configureInfoServer 在类中 HRegionServer
  - getDumpServlet
```
protected Class<? extends javax.servlet.http.HttpServlet> getDumpServlet()
```
    覆盖:
    
    getDumpServlet 在类中 HRegionServer
  - getTableDescriptors
```
public TableDescriptors getTableDescriptors()
```
    指定者:
    
    getTableDescriptors 在接口中 MasterServices
    
    覆盖:
    
    getTableDescriptors 在类中 HRegionServer
    
    返回:
    Return table descriptors implementation.
  - getServerManager
```
public ServerManager getServerManager()
```
    指定者:
    
    getServerManager 在接口中 MasterServices
    
    返回:
    Master's ServerManager instance.
  - getMasterFileSystem
```
public MasterFileSystem getMasterFileSystem()
```
    指定者:
    
    getMasterFileSystem 在接口中 MasterServices
    
    返回:
    Master's filesystem MasterFileSystem utility class.
  - getTableNamespaceManager
```
public TableNamespaceManager getTableNamespaceManager()
```
    指定者:
    
    getTableNamespaceManager 在接口中 MasterServices
    
    返回:
    Master's instance of TableNamespaceManager
  - sendShutdownInterrupt
```
protected void sendShutdownInterrupt()
```
    从类复制的说明: HRegionServer
    
    Called on stop/abort before closing the cluster connection and meta locator.
    
    覆盖:
    
    sendShutdownInterrupt 在类中 HRegionServer
  - stopServiceThreads
```
protected void stopServiceThreads()
```
    从类复制的说明: HRegionServer
    
    Wait on all threads to finish. Presumption is that all closes and stops have already been called.
    
    覆盖:
    
    stopServiceThreads 在类中 HRegionServer
  - balance
```
public boolean balance()
                throws IOException
```
    抛出:
    
    IOException
  - balance
```
public boolean balance(boolean force)
                throws IOException
```
    抛出:
    
    IOException
  - normalizeRegions
```
public boolean normalizeRegions()
                         throws IOException,
                                CoordinatedStateException
```
    Perform normalization of cluster (invoked by RegionNormalizerChore).
    
    返回:
    true if normalization step was performed successfully, false otherwise (specifically, if HMaster hasn't been initialized properly or normalization is globally disabled)
    
    抛出:
    
    IOException
    
    CoordinatedStateException
  - setCatalogJanitorEnabled
```
public void setCatalogJanitorEnabled(boolean b)
```
    Switch for the background CatalogJanitor thread. Used for testing. The thread will continue to run. It will just be a noop if disabled.
    
    参数:
    b - If false, the catalog janitor won't do anything.
  - dispatchMergingRegions
```
public void dispatchMergingRegions(HRegionInfo region_a,
                          HRegionInfo region_b,
                          boolean forcible,
                          User user)
                            throws IOException
```
    从接口复制的说明: MasterServices
    
    Merge two regions. The real implementation is on the regionserver, master just move the regions together and send MERGE RPC to regionserver
    
    指定者:
    
    dispatchMergingRegions 在接口中 MasterServices
    
    参数:
    region_a - region to merge
    region_b - region to merge
    forcible - true if do a compulsory merge, otherwise we will only merge two adjacent regions
    user - effective user
    
    抛出:
    
    IOException
  - move
```
public void move(byte[] encodedRegionName,
        byte[] destServerName)
          throws HBaseIOException
```
    抛出:
    
    HBaseIOException
  - createTable
```
public long createTable(HTableDescriptor hTableDescriptor,
               byte[][] splitKeys,
               long nonceGroup,
               long nonce)
                 throws IOException
```
    从接口复制的说明: MasterServices
    
    Create a table using the given table definition.
    
    指定者:
    
    createTable 在接口中 MasterServices
    
    参数:
    hTableDescriptor - The table definition
    splitKeys - Starting row keys for the initial table regions. If null
    nonce - a single region is created.
    
    抛出:
    
    IOException
  - createSystemTable
```
public long createSystemTable(HTableDescriptor hTableDescriptor)
                       throws IOException
```
    从接口复制的说明: MasterServices
    
    Create a system table using the given table definition.
    
    指定者:
    
    createSystemTable 在接口中 MasterServices
    
    参数:
    hTableDescriptor - The system table definition a single region is created.
    
    抛出:
    
    IOException
  - deleteTable
```
public long deleteTable(TableName tableName,
               long nonceGroup,
               long nonce)
                 throws IOException
```
    从接口复制的说明: MasterServices
    
    Delete a table
    
    指定者:
    
    deleteTable 在接口中 MasterServices
    
    参数:
    tableName - The table name
    
    抛出:
    
    IOException
  - truncateTable
```
public void truncateTable(TableName tableName,
                 boolean preserveSplits,
                 long nonceGroup,
                 long nonce)
                   throws IOException
```
    从接口复制的说明: MasterServices
    
    Truncate a table
    
    指定者:
    
    truncateTable 在接口中 MasterServices
    
    参数:
    tableName - The table name
    preserveSplits - True if the splits should be preserved
    
    抛出:
    
    IOException
  - addColumn
```
public void addColumn(TableName tableName,
             HColumnDescriptor columnDescriptor,
             long nonceGroup,
             long nonce)
               throws IOException
```
    从接口复制的说明: MasterServices
    
    Add a new column to an existing table
    
    指定者:
    
    addColumn 在接口中 MasterServices
    
    参数:
    tableName - The table name
    columnDescriptor - The column definition
    
    抛出:
    
    IOException
  - modifyColumn
```
public void modifyColumn(TableName tableName,
                HColumnDescriptor descriptor,
                long nonceGroup,
                long nonce)
                  throws IOException
```
    从接口复制的说明: MasterServices
    
    Modify the column descriptor of an existing column in an existing table
    
    指定者:
    
    modifyColumn 在接口中 MasterServices
    
    参数:
    tableName - The table name
    descriptor - The updated column definition
    
    抛出:
    
    IOException
  - deleteColumn
```
public void deleteColumn(TableName tableName,
                byte[] columnName,
                long nonceGroup,
                long nonce)
                  throws IOException
```
    从接口复制的说明: MasterServices
    
    Delete a column from an existing table
    
    指定者:
    
    deleteColumn 在接口中 MasterServices
    
    参数:
    tableName - The table name
    columnName - The column name
    
    抛出:
    
    IOException
  - enableTable
```
public long enableTable(TableName tableName,
               long nonceGroup,
               long nonce)
                 throws IOException
```
    从接口复制的说明: MasterServices
    
    Enable an existing table
    
    指定者:
    
    enableTable 在接口中 MasterServices
    
    参数:
    tableName - The table name
    
    抛出:
    
    IOException
  - disableTable
```
public long disableTable(TableName tableName,
                long nonceGroup,
                long nonce)
                  throws IOException
```
    从接口复制的说明: MasterServices
    
    Disable an existing table
    
    指定者:
    
    disableTable 在接口中 MasterServices
    
    参数:
    tableName - The table name
    
    抛出:
    
    IOException
  - modifyTable
```
public void modifyTable(TableName tableName,
               HTableDescriptor descriptor,
               long nonceGroup,
               long nonce)
                 throws IOException
```
    从接口复制的说明: MasterServices
    
    Modify the descriptor of an existing table
    
    指定者:
    
    modifyTable 在接口中 MasterServices
    
    参数:
    tableName - The table name
    descriptor - The updated table descriptor
    
    抛出:
    
    IOException
  - checkTableModifiable
```
public void checkTableModifiable(TableName tableName)
                          throws IOException,
                                 TableNotFoundException,
                                 TableNotDisabledException
```
    从接口复制的说明: MasterServices
    
    Check table is modifiable; i.e. exists and is offline.
    
    指定者:
    
    checkTableModifiable 在接口中 MasterServices
    
    参数:
    tableName - Name of table to check.
    
    抛出:
    
    TableNotDisabledException
    
    TableNotFoundException
    
    IOException
  - getClusterStatus
```
public ClusterStatus getClusterStatus()
                               throws IOException
```
    抛出:
    
    IOException
  - getClusterStatusWithoutCoprocessor
```
public ClusterStatus getClusterStatusWithoutCoprocessor()
                                                 throws InterruptedIOException
```
    返回:
    cluster status
    
    抛出:
    
    InterruptedIOException
  - getLoadedCoprocessors
```
public static String getLoadedCoprocessors()
```
    The set of loaded coprocessors is stored in a static set. Since it's statically allocated, it does not require that HMaster's cpHost be initialized prior to accessing it.
    
    返回:
    a String representation of the set of names of the loaded coprocessors.
  - getMasterStartTime
```
public long getMasterStartTime()
```
    返回:
    timestamp in millis when HMaster was started.
  - getMasterActiveTime
```
public long getMasterActiveTime()
```
    返回:
    timestamp in millis when HMaster became the active master.
  - getMasterFinishedInitializationTime
```
public long getMasterFinishedInitializationTime()
```
    返回:
    timestamp in millis when HMaster finished becoming the active master
  - getNumWALFiles
```
public int getNumWALFiles()
```
  - getWalProcedureStore
```
public WALProcedureStore getWalProcedureStore()
```
  - getRegionServerInfoPort
```
public int getRegionServerInfoPort(ServerName sn)
```
  - getRegionServerVersion
```
public String getRegionServerVersion(ServerName sn)
```
    指定者:
    
    getRegionServerVersion 在接口中 MasterServices
  - checkIfShouldMoveSystemRegionAsync
```
public void checkIfShouldMoveSystemRegionAsync()
```
    指定者:
    
    checkIfShouldMoveSystemRegionAsync 在接口中 MasterServices
  - getMasterCoprocessors
```
public String[] getMasterCoprocessors()
```
    返回:
    array of coprocessor SimpleNames.
  - abort
```
public void abort(String msg,
         Throwable t)
```
    从类复制的说明: HRegionServer
    
    Cause the server to exit without closing the regions it is serving, the log it is using and without notifying the master. Used unit testing and on catastrophic events such as HDFS is yanked out from under hbase or we OOME.
    
    指定者:
    
    abort 在接口中 Abortable
    
    覆盖:
    
    abort 在类中 HRegionServer
    
    参数:
    msg - the reason we are aborting
    t - the exception that caused the abort, or null
  - getZooKeeper
```
public ZooKeeperWatcher getZooKeeper()
```
    从接口复制的说明: Server
    
    Gets the ZooKeeper instance for this server.
    
    指定者:
    
    getZooKeeper 在接口中 Server
    
    覆盖:
    
    getZooKeeper 在类中 HRegionServer
  - getMasterCoprocessorHost
```
public MasterCoprocessorHost getMasterCoprocessorHost()
```
    指定者:
    
    getMasterCoprocessorHost 在接口中 MasterServices
    
    返回:
    Master's instance of MasterCoprocessorHost
  - getMasterQuotaManager
```
public MasterQuotaManager getMasterQuotaManager()
```
    指定者:
    
    getMasterQuotaManager 在接口中 MasterServices
    
    返回:
    Master's instance of MasterQuotaManager
  - getMasterProcedureExecutor
```
public ProcedureExecutor<MasterProcedureEnv> getMasterProcedureExecutor()
```
    指定者:
    
    getMasterProcedureExecutor 在接口中 MasterServices
    
    返回:
    Master's instance of ProcedureExecutor
  - getServerName
```
public ServerName getServerName()
```
    指定者:
    
    getServerName 在接口中 Server
    
    覆盖:
    
    getServerName 在类中 HRegionServer
    
    返回:
    The unique server name for this server.
  - getAssignmentManager
```
public AssignmentManager getAssignmentManager()
```
    指定者:
    
    getAssignmentManager 在接口中 MasterServices
    
    返回:
    Master's instance of the AssignmentManager
  - getRegionServerFatalLogBuffer
```
public MemoryBoundedLogMessageBuffer getRegionServerFatalLogBuffer()
```
  - shutdown
```
public void shutdown()
              throws IOException
```
    抛出:
    
    IOException
  - stopMaster
```
public void stopMaster()
                throws IOException
```
    抛出:
    
    IOException
  - isActiveMaster
```
public boolean isActiveMaster()
```
    Report whether this master is currently the active master or not. If not active master, we are parked on ZK waiting to become active. This method is used for testing.
    
    返回:
    true if active master, false if not.
  - isInitialized
```
public boolean isInitialized()
```
    Report whether this master has completed with its initialization and is ready. If ready, the master is also the active master. A standby master is never ready. This method is used for testing.
    
    指定者:
    
    isInitialized 在接口中 MasterServices
    
    返回:
    true if master is ready to go, false if not.
  - isInMaintenanceMode
```
public boolean isInMaintenanceMode()
                            throws IOException
```
    Report whether this master is in maintenance mode.
    
    指定者:
    
    isInMaintenanceMode 在接口中 MasterServices
    
    返回:
    true if master is in maintenanceMode
    
    抛出:
    
    IOException
  - setInitialized
```
public void setInitialized(boolean isInitialized)
```
  - getInitializedEvent
```
public MasterProcedureScheduler.ProcedureEvent getInitializedEvent()
```
  - isServerCrashProcessingEnabled
```
public boolean isServerCrashProcessingEnabled()
```
    ServerCrashProcessingEnabled is set false before completing assignMeta to prevent processing of crashed servers.
    
    指定者:
    
    isServerCrashProcessingEnabled 在接口中 MasterServices
    
    返回:
    true if assignMeta has completed;
  - setServerCrashProcessingEnabled
```
public void setServerCrashProcessingEnabled(boolean b)
```
  - getServerCrashProcessingEnabledEvent
```
public MasterProcedureScheduler.ProcedureEvent getServerCrashProcessingEnabledEvent()
```
  - isInitializationStartsMetaRegionAssignment
```
public boolean isInitializationStartsMetaRegionAssignment()
```
    Report whether this master has started initialization and is about to do meta region assignment
    
    返回:
    true if master is in initialization & about to assign hbase:meta regions
  - getAverageLoad
```
public double getAverageLoad()
```
    Compute the average load across all region servers. Currently, this uses a very naive computation - just uses the number of regions being served, ignoring stats about number of requests.
    
    返回:
    the average load
  - getSplitPlanCount
```
public long getSplitPlanCount()
```
  - getMergePlanCount
```
public long getMergePlanCount()
```
  - registerService
```
public boolean registerService(com.google.protobuf.Service instance)
```
    从接口复制的说明: RegionServerServices
    
    Registers a new protocol buffer Service subclass as a coprocessor endpoint to be available for handling
    
    指定者:
    
    registerService 在接口中 MasterServices
    
    指定者:
    
    registerService 在接口中 RegionServerServices
    
    覆盖:
    
    registerService 在类中 HRegionServer
    
    参数:
    instance - the Service subclass instance to expose as a coprocessor endpoint
    
    返回:
    true if the registration was successful, false
  - constructMaster
```
public static HMaster constructMaster(Class<? extends HMaster> masterClass,
                      org.apache.hadoop.conf.Configuration conf,
                      CoordinatedStateManager cp)
```
    Utility for constructing an instance of the passed HMaster class.
    
    参数:
    masterClass -
    conf -
    
    返回:
    HMaster instance.
  - main
```
public static void main(String[] args)
```
    另请参阅:
    HMasterCommandLine
  - getHFileCleaner
```
public HFileCleaner getHFileCleaner()
```
  - getLogCleaner
```
public LogCleaner getLogCleaner()
```
  - getSnapshotManager
```
public SnapshotManager getSnapshotManager()
```
    指定者:
    
    getSnapshotManager 在接口中 MasterServices
    
    返回:
    the underlying snapshot manager
  - getMasterProcedureManagerHost
```
public MasterProcedureManagerHost getMasterProcedureManagerHost()
```
    指定者:
    
    getMasterProcedureManagerHost 在接口中 MasterServices
    
    返回:
    the underlying MasterProcedureManagerHost
  - createNamespace
```
public void createNamespace(NamespaceDescriptor descriptor,
                   long nonceGroup,
                   long nonce)
                     throws IOException
```
    从接口复制的说明: MasterServices
    
    Create a new namespace
    
    指定者:
    
    createNamespace 在接口中 MasterServices
    
    参数:
    descriptor - descriptor which describes the new namespace
    
    抛出:
    
    IOException
  - createNamespaceSync
```
public void createNamespaceSync(NamespaceDescriptor descriptor,
                       long nonceGroup,
                       long nonce,
                       boolean executeCoprocessor)
                         throws IOException
```
    从接口复制的说明: MasterServices
    
    Create a new namespace synchronously.
    
    指定者:
    
    createNamespaceSync 在接口中 MasterServices
    
    参数:
    descriptor - descriptor which describes the new namespace
    
    抛出:
    
    IOException
  - modifyNamespace
```
public void modifyNamespace(NamespaceDescriptor descriptor,
                   long nonceGroup,
                   long nonce)
                     throws IOException
```
    从接口复制的说明: MasterServices
    
    Modify an existing namespace
    
    指定者:
    
    modifyNamespace 在接口中 MasterServices
    
    参数:
    descriptor - descriptor which updates the existing namespace
    
    抛出:
    
    IOException
  - deleteNamespace
```
public void deleteNamespace(String name,
                   long nonceGroup,
                   long nonce)
                     throws IOException
```
    从接口复制的说明: MasterServices
    
    Delete an existing namespace. Only empty namespaces (no tables) can be removed.
    
    指定者:
    
    deleteNamespace 在接口中 MasterServices
    
    参数:
    name - namespace name
    
    抛出:
    
    IOException
  - ensureNamespaceExists
```
protected void ensureNamespaceExists(String name)
                              throws IOException,
                                     NamespaceNotFoundException
```
    Ensure that the specified namespace exists, otherwise throws a NamespaceNotFoundException
    
    参数:
    name - the namespace to check
    
    抛出:
    
    IOException - if the namespace manager is not ready yet.
    
    NamespaceNotFoundException - if the namespace does not exists
  - getNamespaceDescriptor
```
public NamespaceDescriptor getNamespaceDescriptor(String name)
                                           throws IOException
```
    从接口复制的说明: MasterServices
    
    Get a namespace descriptor by name
    
    指定者:
    
    getNamespaceDescriptor 在接口中 MasterServices
    
    参数:
    name - name of namespace descriptor
    
    返回:
    A descriptor
    
    抛出:
    
    IOException
  - listNamespaceDescriptors
```
public List<NamespaceDescriptor> listNamespaceDescriptors()
                                                   throws IOException
```
    从接口复制的说明: MasterServices
    
    List available namespace descriptors
    
    指定者:
    
    listNamespaceDescriptors 在接口中 MasterServices
    
    返回:
    A descriptor
    
    抛出:
    
    IOException
  - abortProcedure
```
public boolean abortProcedure(long procId,
                     boolean mayInterruptIfRunning)
                       throws IOException
```
    从接口复制的说明: MasterServices
    
    Abort a procedure.
    
    指定者:
    
    abortProcedure 在接口中 MasterServices
    
    参数:
    procId - ID of the procedure
    mayInterruptIfRunning - if the proc completed at least one step, should it be aborted?
    
    返回:
    true if aborted, false if procedure already completed or does not exist
    
    抛出:
    
    IOException
  - listProcedures
```
public List<ProcedureInfo> listProcedures()
                                   throws IOException
```
    从接口复制的说明: MasterServices
    
    List procedures
    
    指定者:
    
    listProcedures 在接口中 MasterServices
    
    返回:
    procedure list
    
    抛出:
    
    IOException
  - listTableDescriptorsByNamespace
```
public List<HTableDescriptor> listTableDescriptorsByNamespace(String name)
                                                       throws IOException
```
    从接口复制的说明: MasterServices
    
    Get list of table descriptors by namespace
    
    指定者:
    
    listTableDescriptorsByNamespace 在接口中 MasterServices
    
    参数:
    name - namespace name
    
    返回:
    descriptors
    
    抛出:
    
    IOException
  - listTableNamesByNamespace
```
public List<TableName> listTableNamesByNamespace(String name)
                                          throws IOException
```
    从接口复制的说明: MasterServices
    
    Get list of table names by namespace
    
    指定者:
    
    listTableNamesByNamespace 在接口中 MasterServices
    
    参数:
    name - namespace name
    
    返回:
    table names
    
    抛出:
    
    IOException
  - listTableDescriptors
```
public List<HTableDescriptor> listTableDescriptors(String namespace,
                                          String regex,
                                          List<TableName> tableNameList,
                                          boolean includeSysTables)
                                            throws IOException
```
    Returns the list of table descriptors that match the specified request
    
    参数:
    namespace - the namespace to query, or null if querying for all
    regex - The regular expression to match against, or null if querying for all
    tableNameList - the list of table names, or null if querying for all
    includeSysTables - False to match only against userspace tables
    
    返回:
    the list of table descriptors
    
    抛出:
    
    IOException
  - listTableNames
```
public List<TableName> listTableNames(String namespace,
                             String regex,
                             boolean includeSysTables)
                               throws IOException
```
    Returns the list of table names that match the specified request
    
    参数:
    regex - The regular expression to match against, or null if querying for all
    namespace - the namespace to query, or null if querying for all
    includeSysTables - False to match only against userspace tables
    
    返回:
    the list of table names
    
    抛出:
    
    IOException
  - getLastMajorCompactionTimestamp
```
public long getLastMajorCompactionTimestamp(TableName table)
                                     throws IOException
```
    指定者:
    
    getLastMajorCompactionTimestamp 在接口中 MasterServices
    
    参数:
    table - the table for which last successful major compaction time is queried
    
    返回:
    the timestamp of the last successful major compaction for the passed table, or 0 if no HFile resulting from a major compaction exists
    
    抛出:
    
    IOException
  - getLastMajorCompactionTimestampForRegion
```
public long getLastMajorCompactionTimestampForRegion(byte[] regionName)
                                              throws IOException
```
    指定者:
    
    getLastMajorCompactionTimestampForRegion 在接口中 MasterServices
    
    返回:
    the timestamp of the last successful major compaction for the passed region or 0 if no HFile resulting from a major compaction exists
    
    抛出:
    
    IOException
  - isBalancerOn
```
public boolean isBalancerOn()
```
    Queries the state of the LoadBalancerTracker. If the balancer is not initialized, false is returned.
    
    返回:
    The state of the load balancer, or false if the load balancer isn't defined.
  - isNormalizerOn
```
public boolean isNormalizerOn()
```
    Queries the state of the RegionNormalizerTracker. If it's not initialized, false is returned.
  - isSplitOrMergeEnabled
```
public boolean isSplitOrMergeEnabled(Admin.MasterSwitchType switchType)
```
    Queries the state of the SplitOrMergeTracker. If it is not initialized, false is returned. If switchType is illegal, false will return.
    
    参数:
    switchType - see Admin.MasterSwitchType
    
    返回:
    The state of the switch
  - getLoadBalancerClassName
```
public String getLoadBalancerClassName()
```
    Fetch the configured LoadBalancer class name. If none is set, a default is returned.
    
    返回:
    The name of the LoadBalancer in use.
  - getRegionNormalizerTracker
```
public RegionNormalizerTracker getRegionNormalizerTracker()
```
    返回:
    RegionNormalizerTracker instance
  - getSplitOrMergeTracker
```
public SplitOrMergeTracker getSplitOrMergeTracker()
```
  - getLoadBalancer
```
public LoadBalancer getLoadBalancer()
```
    指定者:
    
    getLoadBalancer 在接口中 MasterServices
    
    返回:
    load balancer

类 HMaster

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.hbase.regionserver.HRegionServer

从接口继承的嵌套类/接口 org.apache.hadoop.hbase.regionserver.RegionServerServices

字段概要

从类继承的字段 org.apache.hadoop.hbase.regionserver.HRegionServer

构造器概要

方法概要

从类继承的方法 org.apache.hadoop.hbase.regionserver.HRegionServer

从类继承的方法 org.apache.hadoop.hbase.util.HasThread

从类继承的方法 java.lang.Object

从接口继承的方法 org.apache.hadoop.hbase.master.MasterServices

从接口继承的方法 org.apache.hadoop.hbase.Server

从接口继承的方法 org.apache.hadoop.hbase.Abortable

从接口继承的方法 org.apache.hadoop.hbase.Stoppable

字段详细资料

MASTER

构造器详细资料

HMaster

方法详细资料

login

waitForMasterActive

getMasterRpcServices

balanceSwitch

getProcessName

canCreateBaseZNode

canUpdateTableDescriptor

createRpcServices

configureInfoServer

getDumpServlet

getTableDescriptors

getServerManager

getMasterFileSystem

getTableNamespaceManager

sendShutdownInterrupt

stopServiceThreads

balance

balance

normalizeRegions

setCatalogJanitorEnabled

dispatchMergingRegions

move

createTable

createSystemTable

deleteTable

truncateTable

addColumn

modifyColumn

deleteColumn

enableTable

disableTable

modifyTable

checkTableModifiable

getClusterStatus

getClusterStatusWithoutCoprocessor

getLoadedCoprocessors

getMasterStartTime

getMasterActiveTime

getMasterFinishedInitializationTime

getNumWALFiles

getWalProcedureStore

getRegionServerInfoPort

getRegionServerVersion

checkIfShouldMoveSystemRegionAsync

getMasterCoprocessors

abort

getZooKeeper

getMasterCoprocessorHost

getMasterQuotaManager

getMasterProcedureExecutor

getServerName

getAssignmentManager

getRegionServerFatalLogBuffer

shutdown

stopMaster

isActiveMaster

isInitialized

isInMaintenanceMode

setInitialized

getInitializedEvent