org.apache.hadoop.hbase.master

Class TableNamespaceManager

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
static String	KEY_MAX_REGIONS
static String	KEY_MAX_TABLES

Constructor Summary

Constructors

Constructor and Description
TableNamespaceManager(MasterServices masterServices)

Method Summary

Methods

Modifier and Type	Method and Description
void	create(NamespaceDescriptor ns)
NamespaceDescriptor	get(String name)
static long	getMaxRegions(NamespaceDescriptor ns)
static long	getMaxTables(NamespaceDescriptor ns)
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)

Methods inherited from class java.lang.Object

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

Field Detail

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

Constructor Detail

TableNamespaceManager

public TableNamespaceManager(MasterServices masterServices)

Method Detail

start

public void start()
           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

remove

public void remove(String name)
            throws IOException

Throws:

IOException

list

public NavigableSet<NamespaceDescriptor> list()
                                       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

getMaxTables

public static long getMaxTables(NamespaceDescriptor ns)
                         throws IOException

Throws:

IOException

getMaxRegions

public static long getMaxRegions(NamespaceDescriptor ns)
                          throws IOException

Throws:

IOException