@InterfaceAudience.Private class DisabledWALProvider extends Object implements WALProvider
WALProvider
used when the WAL is disabled. Should only be used
when severe data loss is acceptable.Modifier and Type | Class and Description |
---|---|
private static class |
DisabledWALProvider.DisabledWAL |
WALProvider.AsyncWriter, WALProvider.Writer, WALProvider.WriterBase
Modifier and Type | Field and Description |
---|---|
(package private) WAL |
disabled |
private static org.slf4j.Logger |
LOG |
Constructor and Description |
---|
DisabledWALProvider() |
Modifier and Type | Method and 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.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
getWALFileLengthProvider
DisabledWALProvider()
public void init(WALFactory factory, org.apache.hadoop.conf.Configuration conf, String providerId, Abortable abortable) throws IOException
WALProvider
init
in interface WALProvider
factory
- factory that made us may not be nullconf
- may not be nullproviderId
- differentiate between providers from one factory. may be nullIOException
public List<WAL> getWALs()
WALProvider
getWALs
in interface WALProvider
public WAL getWAL(RegionInfo region) throws IOException
getWAL
in interface WALProvider
region
- the region which we want to get a WAL for it. Could be null.IOException
public void close() throws IOException
WALProvider
close
in interface WALProvider
IOException
public void shutdown() throws IOException
WALProvider
shutdown
in interface WALProvider
IOException
public long getNumLogFiles()
WALProvider
getNumLogFiles
in interface WALProvider
public long getLogFileSize()
WALProvider
getLogFileSize
in interface WALProvider
public void addWALActionsListener(WALActionsListener listener)
WALProvider
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.
addWALActionsListener
in interface WALProvider
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