org.apache.hadoop.hbase

Interface TableDescriptors

All Known Implementing Classes:

FSTableDescriptors

@InterfaceAudience.Private
public interface TableDescriptors

Get, remove and modify table descriptors. Used by servers to host descriptors.

Method Summary

Modifier and Type	Method and Description
void	add(TableDescriptor htd) Add or update descriptor
TableDescriptor	get(TableName tableName)
Map<String,TableDescriptor>	getAll() Get Map of all TableDescriptors.
Map<String,TableDescriptor>	getByNamespace(String name) Get Map of all NamespaceDescriptors for a given namespace.
TableDescriptor	remove(TableName tablename)
void	setCacheOff() Disables the tabledescriptor cache
void	setCacheOn() Enables the tabledescriptor cache

Method Detail

get

TableDescriptor get(TableName tableName)
             throws IOException

Parameters:

tableName -

Returns:

TableDescriptor for tablename

Throws:

IOException

getByNamespace

Map<String,TableDescriptor> getByNamespace(String name)
                                    throws IOException

Get Map of all NamespaceDescriptors for a given namespace.

Returns:

Map of all descriptors.

Throws:

IOException

getAll

Map<String,TableDescriptor> getAll()
                            throws IOException

Get Map of all TableDescriptors. Populates the descriptor cache as a side effect. Notice: the key of map is the table name which contains namespace. It was generated by TableName.getNameWithNamespaceInclAsString().

Returns:

Map of all descriptors.

Throws:

IOException

add

void add(TableDescriptor htd)
  throws IOException

Add or update descriptor

Parameters:

htd - Descriptor to set into TableDescriptors

Throws:

IOException

remove

TableDescriptor remove(TableName tablename)
                throws IOException

Parameters:

tablename -

Returns:

Instance of table descriptor or null if none found.

Throws:

IOException

setCacheOn

void setCacheOn()
         throws IOException

Enables the tabledescriptor cache

Throws:

IOException

setCacheOff

void setCacheOff()
          throws IOException

Disables the tabledescriptor cache

Throws:

IOException