org.apache.hadoop.hbase.wal

类 RegionGroupingProvider

java.lang.Object

org.apache.hadoop.hbase.wal.RegionGroupingProvider

所有已实现的接口:

WALProvider

@InterfaceAudience.Private
public class RegionGroupingProvider
extends Object
implements WALProvider

A WAL Provider that returns a WAL per group of regions. This provider follows the decorator pattern and mainly holds the logic for WAL grouping. WAL creation/roll/close is delegated to DELEGATE_PROVIDER Region grouping is handled via RegionGroupingProvider.RegionGroupingStrategy and can be configured via the property "hbase.wal.regiongrouping.strategy". Current strategy choices are

• defaultStrategy : Whatever strategy this version of HBase picks. currently "bounded".
• identity : each region belongs to its own group.
• bounded : bounded number of groups and region evenly assigned to each group.

Optionally, a FQCN to a custom implementation may be given.

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	RegionGroupingProvider.RegionGroupingStrategy Map identifiers to a group number.

从接口继承的嵌套类/接口 org.apache.hadoop.hbase.wal.WALProvider

WALProvider.AsyncWriter, WALProvider.Writer, WALProvider.WriterBase

字段概要

字段

限定符和类型	字段和说明
static String	DEFAULT_DELEGATE_PROVIDER
static String	DEFAULT_REGION_GROUPING_STRATEGY
static String	DELEGATE_PROVIDER delegate provider for WAL creation/roll/close
static String	REGION_GROUPING_STRATEGY

构造器概要

构造器

构造器和说明
RegionGroupingProvider()

方法概要

限定符和类型	方法和说明
void	addWALActionsListener(WALActionsListener listener) Add a WALActionsListener.
void	close() shutdown utstanding WALs and clean up any persisted state.
long	getLogFileSize() Get size of the log files this provider is managing
long	getNumLogFiles() Get number of the log files this provider is managing
WAL	getWAL(RegionInfo region)
List<WAL>	getWALs()
void	init(WALFactory factory, org.apache.hadoop.conf.Configuration conf, String providerId) Set up the provider to create wals. will only be called once per instance.
void	shutdown() persist outstanding WALs to storage and stop accepting new appends.

从类继承的方法 java.lang.Object

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

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

getWALFileLengthProvider

字段详细资料

REGION_GROUPING_STRATEGY

public static final String REGION_GROUPING_STRATEGY

另请参阅:

常量字段值

DEFAULT_REGION_GROUPING_STRATEGY

public static final String DEFAULT_REGION_GROUPING_STRATEGY

DELEGATE_PROVIDER

public static final String DELEGATE_PROVIDER

delegate provider for WAL creation/roll/close

另请参阅:

常量字段值

DEFAULT_DELEGATE_PROVIDER

public static final String DEFAULT_DELEGATE_PROVIDER

构造器详细资料

RegionGroupingProvider

public RegionGroupingProvider()

方法详细资料

init

public void init(WALFactory factory,
                 org.apache.hadoop.conf.Configuration conf,
                 String providerId)
          throws IOException

从接口复制的说明: WALProvider

Set up the provider to create wals. will only be called once per instance.

指定者:

init 在接口中 WALProvider

参数:

factory - factory that made us may not be null

conf - may not be null

providerId - differentiate between providers from one factory. may be null

抛出:

IOException

getWALs

public List<WAL> getWALs()

指定者:

getWALs 在接口中 WALProvider

返回:

the List of WALs that are used by this server

getWAL

public WAL getWAL(RegionInfo region)
           throws IOException

指定者:

getWAL 在接口中 WALProvider

参数:

region - the region which we want to get a WAL for it. Could be null.

返回:

a WAL for writing entries for the given region.

抛出:

IOException

shutdown

public void shutdown()
              throws IOException

从接口复制的说明: WALProvider

persist outstanding WALs to storage and stop accepting new appends. This method serves as shorthand for sending a sync to every WAL provided by a given implementation. Those WALs will also stop accepting new writes.

指定者:

shutdown 在接口中 WALProvider

抛出:

IOException

close

public void close()
           throws IOException

从接口复制的说明: WALProvider

shutdown utstanding WALs and clean up any persisted state. Call this method only when you will not need to replay any of the edits to the WALs from this provider. After this call completes, the underlying resources should have been reclaimed.

指定者:

close 在接口中 WALProvider

抛出:

IOException

getNumLogFiles

public long getNumLogFiles()

从接口复制的说明: WALProvider

Get number of the log files this provider is managing

指定者:

getNumLogFiles 在接口中 WALProvider

getLogFileSize

public long getLogFileSize()

从接口复制的说明: WALProvider

Get size of the log files this provider is managing

指定者:

getLogFileSize 在接口中 WALProvider

addWALActionsListener

public void addWALActionsListener(WALActionsListener listener)

从接口复制的说明: WALProvider

Add a WALActionsListener.

Notice that you must call this method before calling WALProvider.getWAL(RegionInfo) as this method will not effect the WAL which has already been created. And as long as we can only it when initialization, it is not thread safe.

指定者:

addWALActionsListener 在接口中 WALProvider