org.apache.hadoop.hbase
Interface HMasterInterface

All Superinterfaces:

VersionedProtocol

All Known Implementing Classes:

HMaster

public interface HMasterInterface
extends VersionedProtocol

Clients interact with the HMasterInterface to gain access to meta-level HBase functionality, like finding an HRegionServer and creating/destroying tables.

Field Summary

static long

versionID Interface version

Method Summary

void	addColumn(Text tableName, HColumnDescriptor column) Adds a column to the specified table
void	createTable(HTableDescriptor desc) Creates a new table
void	deleteColumn(Text tableName, Text columnName) Deletes a column from the specified table
void	deleteTable(Text tableName) Deletes a table
void	disableTable(Text tableName) Take table offline
void	enableTable(Text tableName) Puts the table on-line (only needed if table has been previously taken offline)
HServerAddress	findRootRegion() Get the location of the root region
boolean	isMasterRunning()
void	shutdown() Shutdown an HBase cluster.

Methods inherited from interface org.apache.hadoop.ipc.VersionedProtocol

getProtocolVersion

Field Detail

versionID

static final long versionID

Interface version

See Also:

Constant Field Values

Method Detail

isMasterRunning

boolean isMasterRunning()

Returns:

true if master is available

createTable

void createTable(HTableDescriptor desc)
                 throws IOException

Creates a new table

Parameters:

desc - table descriptor

Throws:

IOException

deleteTable

void deleteTable(Text tableName)
                 throws IOException

Deletes a table

Parameters:

tableName -

Throws:

IOException

addColumn

void addColumn(Text tableName,
               HColumnDescriptor column)
               throws IOException

Adds a column to the specified table

Parameters:

tableName -

column - column descriptor

Throws:

IOException

deleteColumn

void deleteColumn(Text tableName,
                  Text columnName)
                  throws IOException

Deletes a column from the specified table

Parameters:

tableName -

columnName -

Throws:

IOException

enableTable

void enableTable(Text tableName)
                 throws IOException

Puts the table on-line (only needed if table has been previously taken offline)

Parameters:

tableName -

Throws:

IOException

disableTable

void disableTable(Text tableName)
                  throws IOException

Take table offline

Parameters:

tableName -

Throws:

IOException

shutdown

void shutdown()
              throws IOException

Shutdown an HBase cluster.

Throws:

IOException

findRootRegion

HServerAddress findRootRegion()

Get the location of the root region

Returns:

address of server that serves the root region