org.apache.hadoop.hbase.quotas

Class DefaultOperationQuota

java.lang.Object

org.apache.hadoop.hbase.quotas.DefaultOperationQuota

All Implemented Interfaces:

OperationQuota

@InterfaceAudience.Private
@InterfaceStability.Evolving
public class DefaultOperationQuota
extends Object
implements OperationQuota

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.quotas.OperationQuota

OperationQuota.OperationType

Constructor Summary

Constructors

Constructor and Description
DefaultOperationQuota(List<QuotaLimiter> limiters) NOTE: The order matters.
DefaultOperationQuota(QuotaLimiter... limiters)

Method Summary

Methods

Modifier and Type	Method and Description
void	addGetResult(Result result) Add a get result.
void	addMutation(Mutation mutation) Add a mutation result.
void	addScanResult(List<Result> results) Add a scan result.
void	checkQuota(int numWrites, int numReads, int numScans) Checks if it is possible to execute the specified operation.
void	close() Cleanup method on operation completion
long	getReadAvailable()
long	getWriteAvailable()

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultOperationQuota

public DefaultOperationQuota(QuotaLimiter... limiters)

DefaultOperationQuota

public DefaultOperationQuota(List<QuotaLimiter> limiters)

NOTE: The order matters. It should be something like [user, table, namespace, global]

Method Detail

checkQuota

public void checkQuota(int numWrites,
              int numReads,
              int numScans)
                throws ThrottlingException

Description copied from interface: OperationQuota

Checks if it is possible to execute the specified operation. The quota will be estimated based on the number of operations to perform and the average size accumulated during time.

Specified by:

checkQuota in interface OperationQuota

Parameters:

numWrites - number of write operation that will be performed

numReads - number of small-read operation that will be performed

numScans - number of long-read operation that will be performed

Throws:

ThrottlingException - if the operation cannot be performed

close

public void close()

Description copied from interface: OperationQuota

Cleanup method on operation completion

Specified by:

close in interface OperationQuota

getReadAvailable

public long getReadAvailable()

Specified by:

getReadAvailable in interface OperationQuota

Returns:

the number of bytes available to read to avoid exceeding the quota

getWriteAvailable

public long getWriteAvailable()

Specified by:

getWriteAvailable in interface OperationQuota

Returns:

the number of bytes available to write to avoid exceeding the quota

addGetResult

public void addGetResult(Result result)

Description copied from interface: OperationQuota

Add a get result. This will be used to calculate the exact quota and have a better short-read average size for the next time.

Specified by:

addGetResult in interface OperationQuota

addScanResult

public void addScanResult(List<Result> results)

Description copied from interface: OperationQuota

Add a scan result. This will be used to calculate the exact quota and have a better long-read average size for the next time.

Specified by:

addScanResult in interface OperationQuota

addMutation

public void addMutation(Mutation mutation)

Description copied from interface: OperationQuota

Add a mutation result. This will be used to calculate the exact quota and have a better mutation average size for the next time.

Specified by:

addMutation in interface OperationQuota