DisabledWALProvider (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.wal.DisabledWALProvider

All Implemented Interfaces:

WALProvider
```
@InterfaceAudience.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 and Description

private static class DisabledWALProvider.DisabledWAL
- Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.wal.WALProvider
  WALProvider.Writer

Nested Classes
Modifier and Type	Class and Description
`private static class`	`DisabledWALProvider.DisabledWAL`

Field Summary

Fields
Modifier and Type Field and Description

(package private) WAL disabled

private static org.apache.commons.logging.Log LOG

Fields
Modifier and Type	Field and Description
`(package private) WAL`	`disabled`
`private static org.apache.commons.logging.Log`	`LOG`

Constructor Summary

Constructors
Constructor and Description

DisabledWALProvider()

Constructors
Constructor and Description
`DisabledWALProvider()`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()` shutdown utstanding WALs and clean up any persisted state.
`WAL`	`getWAL(byte[] identifier)`
`void`	`init(WALFactory factory, org.apache.hadoop.conf.Configuration conf, List<WALActionsListener> listeners, String providerId)` 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

- Field Detail
  - LOG
```
private static final org.apache.commons.logging.Log LOG
```
  - disabled
```
WAL disabled
```
- Constructor Detail
  - DisabledWALProvider
```
DisabledWALProvider()
```
- Method Detail
  - init
```
public void init(WALFactory factory,
        org.apache.hadoop.conf.Configuration conf,
        List<WALActionsListener> listeners,
        String providerId)
          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
    listeners - may be null
    providerId - differentiate between providers from one factory. may be null
    
    Throws:
    
    IOException
  - getWAL
```
public WAL getWAL(byte[] identifier)
           throws IOException
```
    Specified by:
    
    getWAL in interface WALProvider
    
    Parameters:
    identifier - may not be null. contents will not be altered.
    
    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

Class DisabledWALProvider

Nested Class Summary

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

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

disabled

Constructor Detail

DisabledWALProvider

Method Detail

init

getWAL

close

shutdown