Wikimedia\Rdbms\LoadMonitorMySQL Class Reference

Basic MySQL load monitor with no external dependencies Uses memcached to cache the replication lag for a short time. More...

Inheritance diagram for Wikimedia\Rdbms\LoadMonitorMySQL:

Collaboration diagram for Wikimedia\Rdbms\LoadMonitorMySQL:

Public Member Functions
	__construct (ILoadBalancer $lb, BagOStuff $srvCache, WANObjectCache $wCache, array $options=[])
Public Member Functions inherited from Wikimedia\Rdbms\LoadMonitor
	getLagTimes (array $serverIndexes, $domain)
	Get an estimate of replication lag (in seconds) for each server.
	scaleLoads (array &$weightByServer, $domain)
	Perform load ratio adjustment before deciding which server to use.
	setLogger (LoggerInterface $logger)
	setMockTime (&$time)
	setStatsdDataFactory (StatsdDataFactoryInterface $statsFactory)
	Sets a StatsdDataFactory instance on the object.

Protected Member Functions
	getWeightScale ( $index, IDatabase $conn=null)
Protected Member Functions inherited from Wikimedia\Rdbms\LoadMonitor
	computeServerStates (array $serverIndexes, $domain, $priorStates)
	getCurrentTime ()
	getNewScaleViaMovingAve ( $lastScale, $naiveScale, $movAveRatio)
	Get the moving average weight scale given a naive and the last iteration value.
	getServerStates (array $serverIndexes, $domain)

Additional Inherited Members
Protected Attributes inherited from Wikimedia\Rdbms\LoadMonitor
ILoadBalancer	$lb
LoggerInterface	$replLogger
BagOStuff	$srvCache
StatsdDataFactoryInterface	$statsd
WANObjectCache	$wanCache

Detailed Description

Basic MySQL load monitor with no external dependencies Uses memcached to cache the replication lag for a short time.

Definition at line 32 of file LoadMonitorMySQL.php.

Constructor & Destructor Documentation

__construct()

Wikimedia\Rdbms\LoadMonitorMySQL::__construct	(	ILoadBalancer	$lb,
		BagOStuff	$srvCache,
		WANObjectCache	$wCache,
		array	$options = [] )

Parameters

ILoadBalancer	$lb
BagOStuff	$srvCache
WANObjectCache	$wCache
array	$options	movingAveRatio: moving average constant for server weight updates based on lag lagWarnThreshold: how many seconds of lag trigger warnings

Reimplemented from Wikimedia\Rdbms\LoadMonitor.

Definition at line 36 of file LoadMonitorMySQL.php.

References Wikimedia\Rdbms\LoadMonitor\$lb, and Wikimedia\Rdbms\LoadMonitor\$srvCache.

Member Function Documentation

getWeightScale()

Wikimedia\Rdbms\LoadMonitorMySQL::getWeightScale ( $index, IDatabase $conn = null )

protected

Parameters

int	$index	Server index
IDatabase | null	$conn	Connection handle or null on connection failure

Returns

float

Since

1.28

Reimplemented from Wikimedia\Rdbms\LoadMonitor.

Definition at line 44 of file LoadMonitorMySQL.php.

References $res, and $s.

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The documentation for this class was generated from the following file:

• includes/libs/rdbms/loadmonitor/LoadMonitorMySQL.php