Package org.apache.hadoop.hbase.namespace

Class NamespaceAuditor

java.lang.Object

org.apache.hadoop.hbase.namespace.NamespaceAuditor

@Private
public class NamespaceAuditor
extends Object

The Class NamespaceAuditor performs checks to ensure operations like table creation and region splitting preserve namespace quota. The namespace quota can be specified while namespace creation.

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.slf4j.Logger	LOG
private MasterServices	masterServices
private NamespaceStateManager	stateManager

Constructor Summary

Constructors

Constructor	Description
NamespaceAuditor(MasterServices masterServices)

Method Summary

Modifier and Type	Method	Description
void	addNamespace(NamespaceDescriptor ns)
void	checkQuotaToCreateTable(TableName tName, int regions)	Check quota to create table.
void	checkQuotaToSplitRegion(RegionInfo hri)
void	checkQuotaToUpdateRegion(TableName tName, int regions)	Check and update region count quota for an existing table.
private void	checkTableTypeAndThrowException(TableName name)
void	deleteNamespace(String namespace)
int	getRegionCountOfTable(TableName tName)	Get region count for table
NamespaceTableAndRegionInfo	getState(String namespace)
boolean	isInitialized()	Checks if namespace auditor is initialized.
void	removeFromNamespaceUsage(TableName tableName)
void	removeRegionFromNamespaceUsage(RegionInfo hri)
void	start()
void	updateQuotaForRegionMerge(RegionInfo mergedRegion)

Methods inherited from class java.lang.Object

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

Field Details

LOG

private static final org.slf4j.Logger LOG

stateManager

private NamespaceStateManager stateManager

masterServices

private MasterServices masterServices

Constructor Details

NamespaceAuditor

public NamespaceAuditor(MasterServices masterServices)

Method Details

start

public void start()
           throws IOException

Throws:

IOException

checkQuotaToCreateTable

public void checkQuotaToCreateTable(TableName tName,
 int regions)
                             throws IOException

Check quota to create table. We add the table information to namespace state cache, assuming the operation will pass. If the operation fails, then the next time namespace state chore runs namespace state cache will be corrected.

Parameters:

tName - - The table name to check quota.

regions - - Number of regions that will be added.

Throws:

IOException - Signals that an I/O exception has occurred.

checkQuotaToUpdateRegion

public void checkQuotaToUpdateRegion(TableName tName,
 int regions)
                              throws IOException

Check and update region count quota for an existing table.

Parameters:

tName - - table name for which region count to be updated.

regions - - Number of regions that will be added.

Throws:

IOException - Signals that an I/O exception has occurred.

checkTableTypeAndThrowException

private void checkTableTypeAndThrowException(TableName name)
                                      throws IOException

Throws:

IOException

getRegionCountOfTable

public int getRegionCountOfTable(TableName tName)
                          throws IOException

Get region count for table

Parameters:

tName - - table name

Returns:

cached region count, or -1 if table status not found

Throws:

IOException - Signals that the namespace auditor has not been initialized

checkQuotaToSplitRegion

public void checkQuotaToSplitRegion(RegionInfo hri)
                             throws IOException

Throws:

IOException

updateQuotaForRegionMerge

public void updateQuotaForRegionMerge(RegionInfo mergedRegion)
                               throws IOException

Throws:

IOException

addNamespace

public void addNamespace(NamespaceDescriptor ns)
                  throws IOException

Throws:

IOException

deleteNamespace

public void deleteNamespace(String namespace)
                     throws IOException

Throws:

IOException

removeFromNamespaceUsage

public void removeFromNamespaceUsage(TableName tableName)
                              throws IOException

Throws:

IOException

removeRegionFromNamespaceUsage

public void removeRegionFromNamespaceUsage(RegionInfo hri)
                                    throws IOException

Throws:

IOException

getState

public NamespaceTableAndRegionInfo getState(String namespace)

Parameters:

namespace - The name of the namespace

Returns:

An instance of NamespaceTableAndRegionInfo

isInitialized

public boolean isInitialized()

Checks if namespace auditor is initialized. Used only for testing.

Returns:

true, if is initialized