org.apache.hadoop.hbase.quotas

Class QuotaCache

java.lang.Object

org.apache.hadoop.hbase.quotas.QuotaCache

All Implemented Interfaces:

Stoppable

@InterfaceAudience.Private
 @InterfaceStability.Evolving
public class QuotaCache
extends Object
implements Stoppable

Cache that keeps track of the quota settings for the users and tables that are interacting with it. To avoid blocking the operations if the requested quota is not in cache an "empty quota" will be returned and the request to fetch the quota information will be enqueued for the next refresh. TODO: At the moment the Cache has a Chore that will be triggered every 5min or on cache-miss events. Later the Quotas will be pushed using the notification system.

Field Summary

Fields

Modifier and Type	Field and Description
static String	REFRESH_CONF_KEY

Constructor Summary

Constructors

Constructor and Description
QuotaCache(RegionServerServices rsServices)

Method Summary

Modifier and Type	Method and Description
QuotaLimiter	getNamespaceLimiter(String namespace) Returns the limiter associated to the specified namespace.
QuotaLimiter	getTableLimiter(TableName table) Returns the limiter associated to the specified table.
QuotaLimiter	getUserLimiter(org.apache.hadoop.security.UserGroupInformation ugi, TableName table) Returns the limiter associated to the specified user/table.
UserQuotaState	getUserQuotaState(org.apache.hadoop.security.UserGroupInformation ugi) Returns the QuotaState associated to the specified user.
boolean	isStopped()
void	start()
void	stop(String why) Stop this service.

Methods inherited from class java.lang.Object

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

Field Detail

REFRESH_CONF_KEY

public static final String REFRESH_CONF_KEY

See Also:

Constant Field Values

Constructor Detail

QuotaCache

public QuotaCache(RegionServerServices rsServices)

Method Detail

start

public void start()
           throws IOException

Throws:

IOException

stop

public void stop(String why)

Description copied from interface: Stoppable

Stop this service. Implementers should favor logging errors over throwing RuntimeExceptions.

Specified by:

stop in interface Stoppable

Parameters:

why - Why we're stopping.

isStopped

public boolean isStopped()

Specified by:

isStopped in interface Stoppable

Returns:

True if Stoppable.stop(String) has been closed.

getUserLimiter

public QuotaLimiter getUserLimiter(org.apache.hadoop.security.UserGroupInformation ugi,
                                   TableName table)

Returns the limiter associated to the specified user/table.

Parameters:

ugi - the user to limit

table - the table to limit

Returns:

the limiter associated to the specified user/table

getUserQuotaState

public UserQuotaState getUserQuotaState(org.apache.hadoop.security.UserGroupInformation ugi)

Returns the QuotaState associated to the specified user.

Parameters:

ugi - the user

Returns:

the quota info associated to specified user

getTableLimiter

public QuotaLimiter getTableLimiter(TableName table)

Returns the limiter associated to the specified table.

Parameters:

table - the table to limit

Returns:

the limiter associated to the specified table

getNamespaceLimiter

public QuotaLimiter getNamespaceLimiter(String namespace)

Returns the limiter associated to the specified namespace.

Parameters:

namespace - the namespace to limit

Returns:

the limiter associated to the specified namespace