org.apache.hadoop.hbase.namespace

Class NamespaceAuditor

java.lang.Object

org.apache.hadoop.hbase.namespace.NamespaceAuditor

@InterfaceAudience.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.

Constructor Summary

Constructors

Constructor and Description
NamespaceAuditor(MasterServices masterServices)

Method Summary

Methods

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

Methods inherited from class java.lang.Object

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

Constructor Detail

NamespaceAuditor

public NamespaceAuditor(MasterServices masterServices)

Method Detail

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.

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(HRegionInfo hri)
                             throws IOException

Throws:

IOException

updateQuotaForRegionMerge

public void updateQuotaForRegionMerge(HRegionInfo hri)
                               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(HRegionInfo hri)
                                    throws IOException

Throws:

IOException

isInitialized

public boolean isInitialized()

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

Returns:

true, if is initialized