org.apache.hadoop.hbase
Interface HConnection

public interface HConnection

Method Summary

void	close(Text tableName) Discard all the information about this table
HRegionInterface	getHRegionConnection(HServerAddress regionServer) Establishes a connection to the region server at the specified address.
HMasterInterface	getMaster()
SortedMap<Text,HRegionLocation>	getTableServers(Text tableName) Gets the servers of the given table.
boolean	isMasterRunning()
HTableDescriptor[]	listTables() List all the userspace tables.
SortedMap<Text,HRegionLocation>	reloadTableServers(Text tableName) Reloads servers for the specified table.
boolean	tableExists(Text tableName) Checks if tableName exists.

Method Detail

getMaster

HMasterInterface getMaster()
                           throws MasterNotRunningException

Returns:

proxy connection to master server for this instance

Throws:

MasterNotRunningException

isMasterRunning

boolean isMasterRunning()

Returns:

- true if the master server is running

tableExists

boolean tableExists(Text tableName)

Checks if tableName exists.

Parameters:

tableName - Table to check.

Returns:

True if table exists already.

listTables

HTableDescriptor[] listTables()
                              throws IOException

List all the userspace tables. In other words, scan the META table. If we wanted this to be really fast, we could implement a special catalog table that just contains table names and their descriptors. Right now, it only exists as part of the META table's region info.

Returns:

- returns an array of HTableDescriptors

Throws:

IOException

getTableServers

SortedMap<Text,HRegionLocation> getTableServers(Text tableName)
                                                throws IOException

Gets the servers of the given table.

Parameters:

tableName - - the table to be located

Returns:

map of startRow -> RegionLocation

Throws:

IOException - - if the table can not be located after retrying

reloadTableServers

SortedMap<Text,HRegionLocation> reloadTableServers(Text tableName)
                                                   throws IOException

Reloads servers for the specified table.

Parameters:

tableName - name of table whose servers are to be reloaded

Returns:

map of start key -> RegionLocation

Throws:

IOException

getHRegionConnection

HRegionInterface getHRegionConnection(HServerAddress regionServer)
                                      throws IOException

Establishes a connection to the region server at the specified address.

Parameters:

regionServer - - the server to connect to

Returns:

proxy for HRegionServer

Throws:

IOException

close

void close(Text tableName)

Discard all the information about this table

Parameters:

tableName - the name of the table to close