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 LoadMonitorMySQL:

Collaboration diagram for LoadMonitorMySQL:

Public Member Functions
	__construct ($parent)
	Construct a new LoadMonitor with a given LoadBalancer parent. More...
	clearCaches ()
	Clear any process and persistent cache of lag times. More...
	getLagTimes ($serverIndexes, $wiki)
	Get an estimate of replication lag (in seconds) for each server. More...
	scaleLoads (&$loads, $group=false, $wiki=false)
	Perform pre-connection load ratio adjustment. More...

Public Attributes
LoadBalancer	$parent

Protected Attributes
BagOStuff	$mainCache
BagOStuff	$srvCache

Private Member Functions
	getLagTimeCacheKey ()

Detailed Description

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

Definition at line 28 of file LoadMonitorMySQL.php.

Constructor & Destructor Documentation

LoadMonitorMySQL::__construct

(

$parent

)

Construct a new LoadMonitor with a given LoadBalancer parent.

Parameters

LoadBalancer

$parent

Implements LoadMonitor.

Definition at line 36 of file LoadMonitorMySQL.php.

References $parent, ObjectCache\getLocalClusterInstance(), and ObjectCache\getLocalServerInstance().

Member Function Documentation

LoadMonitorMySQL::clearCaches

(

)

Clear any process and persistent cache of lag times.

Since

1.27

Implements LoadMonitor.

Definition at line 135 of file LoadMonitorMySQL.php.

References getLagTimeCacheKey().

LoadMonitorMySQL::getLagTimeCacheKey ( )

private

Definition at line 141 of file LoadMonitorMySQL.php.

Referenced by clearCaches(), and getLagTimes().

LoadMonitorMySQL::getLagTimes	(		$serverIndexes,
			$wiki
	)

Get an estimate of replication lag (in seconds) for each server.

Values may be "false" if replication is too broken to estimate

Parameters

array	$serverIndexes
string	$wiki

Returns

array Map of (server index => float|int|bool)

Implements LoadMonitor.

Definition at line 46 of file LoadMonitorMySQL.php.

References $cache, $mainCache, $value, as, getLagTimeCacheKey(), use, and wfDebugLog().

LoadMonitorMySQL::scaleLoads	(	&	$loads,
			$group = false,
			$wiki = false
	)

Perform pre-connection load ratio adjustment.

Parameters

array	&$loads
string | bool	$group	The selected query group. Default: false
string | bool	$wiki	Default: false

Implements LoadMonitor.

Definition at line 43 of file LoadMonitorMySQL.php.

Member Data Documentation

BagOStuff LoadMonitorMySQL::$mainCache

protected

Definition at line 34 of file LoadMonitorMySQL.php.

Referenced by getLagTimes().

LoadBalancer LoadMonitorMySQL::$parent

Definition at line 30 of file LoadMonitorMySQL.php.

Referenced by __construct().

BagOStuff LoadMonitorMySQL::$srvCache

protected

Definition at line 32 of file LoadMonitorMySQL.php.

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

• includes/db/loadbalancer/LoadMonitorMySQL.php