MetaUtils (Apache HBase 1.2.12 API)

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java.lang.Object
- org.apache.hadoop.hbase.util.MetaUtils

```
@InterfaceAudience.Private
public class MetaUtils
extends Object
```
Contains utility methods for manipulating HBase meta tables. Be sure to call shutdown() when done with this class so it closes resources opened during meta processing (ROOT, META, etc.). Be careful how you use this class. If used during migrations, be careful when using this class to check whether migration is needed.

Field Summary

Fields
Modifier and Type	Field and Description
`private org.apache.hadoop.conf.Configuration`	`conf`
`private FSTableDescriptors`	`descriptors`
`private org.apache.hadoop.fs.FileSystem`	`fs`
`private static org.apache.commons.logging.Log`	`LOG`
`private HRegion`	`metaRegion`
`private Map<byte[],HRegion>`	`metaRegions`
`private WALFactory`	`walFactory`

Constructor Summary

Constructors
Constructor and Description

MetaUtils()
Default constructor

MetaUtils(org.apache.hadoop.conf.Configuration conf)

Method Summary

Methods
Modifier and Type	Method and Description
`WAL`	`getLog(HRegionInfo info)`
`HRegion`	`getMetaRegion()`
`private void`	`initialize()` Verifies that DFS is available and that HBase is off-line.
`private HRegion`	`openMetaRegion()`
`void`	`shutdown()` Closes catalog regions if open.

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

conf

private final org.apache.hadoop.conf.Configuration conf

descriptors

private final FSTableDescriptors descriptors

fs

private org.apache.hadoop.fs.FileSystem fs

walFactory
```
private WALFactory walFactory
```

metaRegion
```
private HRegion metaRegion
```

metaRegions

private Map<byte[],HRegion> metaRegions

Constructor Detail

MetaUtils

public MetaUtils()
          throws IOException

Default constructor

Throws:: IOException - e

MetaUtils

public MetaUtils(org.apache.hadoop.conf.Configuration conf)
          throws IOException

Parameters:: conf - Configuration
Throws:: IOException - e

Method Detail
- initialize
```
private void initialize()
                 throws IOException
```
  Verifies that DFS is available and that HBase is off-line.
  
  Throws:
  
  IOException - e
- getLog
```
public WAL getLog(HRegionInfo info)
           throws IOException
```
  Returns:
  the WAL associated with the given region
  
  Throws:
  
  IOException - e
- getMetaRegion
```
public HRegion getMetaRegion()
                      throws IOException
```
  Returns:
  HRegion for meta region
  
  Throws:
  
  IOException - e
- shutdown
```
public void shutdown()
```
  Closes catalog regions if open. Also closes and deletes the WAL. You must call this method if you want to persist changes made during a MetaUtils edit session.
- openMetaRegion
```
private HRegion openMetaRegion()
                        throws IOException
```
  Throws:
  
  IOException

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