TableNamespaceManager (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.master.TableNamespaceManager

```
@InterfaceAudience.Private
public class TableNamespaceManager
extends Object
```
This is a helper class used to manage the namespace metadata that is stored in TableName.NAMESPACE_TABLE_NAME It also mirrors updates to the ZK store by forwarding updates to ZKNamespaceManager

Field Summary

Fields
Modifier and Type	Field and Description
`private org.apache.hadoop.conf.Configuration`	`conf`
`(package private) static int`	`DEFAULT_NS_INIT_TIMEOUT`
`private boolean`	`initialized`
`static String`	`KEY_MAX_REGIONS`
`static String`	`KEY_MAX_TABLES`
`private static org.apache.commons.logging.Log`	`LOG`
`private MasterServices`	`masterServices`
`(package private) static String`	`NS_INIT_TIMEOUT`
`private Table`	`nsTable`
`private ZKNamespaceManager`	`zkNamespaceManager`

Constructor Summary

Constructors
Constructor and Description

TableNamespaceManager(MasterServices masterServices)

Constructors
Constructor and Description
`TableNamespaceManager(MasterServices masterServices)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`create(NamespaceDescriptor ns)`
`private void`	`create(Table table, NamespaceDescriptor ns)`
`private void`	`createNamespaceTable(MasterServices masterServices)`
`NamespaceDescriptor`	`get(String name)`
`private NamespaceDescriptor`	`get(Table table, String name)`
`static long`	`getMaxRegions(NamespaceDescriptor ns)`
`static long`	`getMaxTables(NamespaceDescriptor ns)`
`private Table`	`getNamespaceTable()`
`private boolean`	`isTableAssigned()`
`boolean`	`isTableAvailableAndInitialized()` This method checks if the namespace table is assigned and then tries to create its HTable.
`NavigableSet<NamespaceDescriptor>`	`list()`
`void`	`remove(String name)`
`void`	`start()`
`void`	`update(NamespaceDescriptor ns)`
`private void`	`upsert(Table table, NamespaceDescriptor ns)`
`(package private) void`	`validateTableAndRegionCount(NamespaceDescriptor desc)`

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 org.apache.hadoop.conf.Configuration conf

masterServices
```
private MasterServices masterServices
```

nsTable
```
private Table nsTable
```

zkNamespaceManager

private ZKNamespaceManager zkNamespaceManager

initialized
```
private boolean initialized
```

KEY_MAX_REGIONS

public static final String KEY_MAX_REGIONS

See Also:: Constant Field Values

KEY_MAX_TABLES

public static final String KEY_MAX_TABLES

See Also:: Constant Field Values

NS_INIT_TIMEOUT
```
static final String NS_INIT_TIMEOUT
```
See Also:
Constant Field Values

DEFAULT_NS_INIT_TIMEOUT
```
static final int DEFAULT_NS_INIT_TIMEOUT
```
See Also:
Constant Field Values

Constructor Detail

TableNamespaceManager

public TableNamespaceManager(MasterServices masterServices)

Method Detail

start

public void start()
           throws IOException

Throws:: IOException

getNamespaceTable

private Table getNamespaceTable()
                         throws IOException

Throws:: IOException

get

public NamespaceDescriptor get(String name)
                        throws IOException

Throws:: IOException

create

public void create(NamespaceDescriptor ns)
            throws IOException

Throws:: IOException

update

public void update(NamespaceDescriptor ns)
            throws IOException

Throws:: IOException

get

private NamespaceDescriptor get(Table table,
                      String name)
                         throws IOException

Throws:: IOException

create

private void create(Table table,
          NamespaceDescriptor ns)
             throws IOException

Throws:: IOException

upsert

private void upsert(Table table,
          NamespaceDescriptor ns)
             throws IOException

Throws:: IOException

remove

public void remove(String name)
            throws IOException

Throws:: IOException

list

public NavigableSet<NamespaceDescriptor> list()
                                       throws IOException

Throws:: IOException

createNamespaceTable

private void createNamespaceTable(MasterServices masterServices)
                           throws IOException

Throws:: IOException

isTableAvailableAndInitialized
```
public boolean isTableAvailableAndInitialized()
                                       throws IOException
```
This method checks if the namespace table is assigned and then tries to create its HTable. If it was already created before, it also makes sure that the connection isn't closed.

Returns:
true if the namespace table manager is ready to serve, false otherwise

Throws:

IOException

isTableAssigned
```
private boolean isTableAssigned()
```

validateTableAndRegionCount

void validateTableAndRegionCount(NamespaceDescriptor desc)
                           throws IOException

Throws:: IOException

getMaxTables

public static long getMaxTables(NamespaceDescriptor ns)
                         throws IOException

Throws:: IOException

getMaxRegions

public static long getMaxRegions(NamespaceDescriptor ns)
                          throws IOException

Throws:: IOException

Class TableNamespaceManager

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

conf

masterServices

nsTable

zkNamespaceManager

initialized

KEY_MAX_REGIONS

KEY_MAX_TABLES

NS_INIT_TIMEOUT

DEFAULT_NS_INIT_TIMEOUT

Constructor Detail

TableNamespaceManager

Method Detail

start

getNamespaceTable

get

create

update

get

create

upsert

remove

list

createNamespaceTable

isTableAvailableAndInitialized

isTableAssigned

validateTableAndRegionCount

getMaxTables

getMaxRegions