Package org.apache.hadoop.hbase.wal

Class DisabledWALProvider

java.lang.Object

org.apache.hadoop.hbase.wal.DisabledWALProvider

All Implemented Interfaces:

WALProvider

@Private
class DisabledWALProvider
extends Object
implements WALProvider

No-op implementation of WALProvider used when the WAL is disabled. Should only be used when severe data loss is acceptable.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	DisabledWALProvider.DisabledWAL

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.wal.WALProvider

WALProvider.AsyncWriter, WALProvider.Writer, WALProvider.WriterBase

Field Summary

Fields

Modifier and Type	Field	Description
(package private) WAL	disabled
private static final org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
DisabledWALProvider()

Method Summary

Modifier and Type	Method	Description
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()	Returns the List of WALs that are used by this server
void	init(WALFactory factory, org.apache.hadoop.conf.Configuration conf, String providerId, Abortable abortable)	Set up the provider to create wals.
void	shutdown()	persist outstanding WALs to storage and stop accepting new appends.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.wal.WALProvider

getWALFileLengthProvider

Field Details

LOG

private static final org.slf4j.Logger LOG

disabled

WAL disabled

Constructor Details

DisabledWALProvider

DisabledWALProvider()

Method Details

init

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

Description copied from interface: WALProvider

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

Specified by:

init in interface WALProvider

Parameters:

factory - factory that made us may not be null

conf - may not be null

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

Throws:

IOException

getWALs

public List<WAL> getWALs()

Description copied from interface: WALProvider

Returns the List of WALs that are used by this server

Specified by:

getWALs in interface WALProvider

getWAL

public WAL getWAL(RegionInfo region)
           throws IOException

Specified by:

getWAL in interface WALProvider

Parameters:

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

Returns:

a WAL for writing entries for the given region.

Throws:

IOException

close

public void close()
           throws IOException

Description copied from interface: 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.

Specified by:

close in interface WALProvider

Throws:

IOException

shutdown

public void shutdown()
              throws IOException

Description copied from interface: 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.

Specified by:

shutdown in interface WALProvider

Throws:

IOException

getNumLogFiles

public long getNumLogFiles()

Description copied from interface: WALProvider

Get number of the log files this provider is managing

Specified by:

getNumLogFiles in interface WALProvider

getLogFileSize

public long getLogFileSize()

Description copied from interface: WALProvider

Get size of the log files this provider is managing

Specified by:

getLogFileSize in interface WALProvider

addWALActionsListener

public void addWALActionsListener(WALActionsListener listener)

Description copied from interface: 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.

Specified by:

addWALActionsListener in interface WALProvider