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

Inheritance diagram for LoadMonitorMySQL:

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Collaboration diagram for LoadMonitorMySQL:

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Public Member Functions
	__construct (ILoadBalancer $lb, BagOStuff $srvCache, BagOStuff $cache, array $options=[])
	Construct a new LoadMonitor with a given LoadBalancer parent.

Public Member Functions inherited from 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)

Protected Member Functions
	getWeightScale ( $index, IDatabase $conn=null)

Protected Member Functions inherited from LoadMonitor
	getServerStates (array $serverIndexes, $domain)

Private Attributes
float	$warmCacheRatio
	What buffer pool use ratio counts as "warm" (e.g.

Additional Inherited Members
Public Attributes inherited from LoadMonitor
const	VERSION = 1

Protected Attributes inherited from LoadMonitor
BagOStuff	$mainCache

ILoadBalancer	$parent

LoggerInterface	$replLogger

BagOStuff	$srvCache

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

◆ __construct()

LoadMonitorMySQL::__construct	(	ILoadBalancer	$lb,
		BagOStuff	$sCache,
		BagOStuff	$cCache,
		array	$options = `[]`
	)

Construct a new LoadMonitor with a given LoadBalancer parent.

Parameters

ILoadBalancer	$lb	LoadBalancer this instance serves
BagOStuff	$sCache	Local server memory cache
BagOStuff	$cCache	Local cluster memory cache
array	$options	Options map

Reimplemented from LoadMonitor.

Definition at line 32 of file LoadMonitorMySQL.php.

References $cache, $options, and LoadMonitor\$srvCache.

Member Function Documentation

◆ getWeightScale()

LoadMonitorMySQL::getWeightScale	(		$index,
		IDatabase	$conn = `null`
	)

protected

Parameters

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

Returns: float

Reimplemented from LoadMonitor.

Definition at line 42 of file LoadMonitorMySQL.php.

References $res, and $s.

Member Data Documentation

◆ $warmCacheRatio

float LoadMonitorMySQL::$warmCacheRatio

private

What buffer pool use ratio counts as "warm" (e.g.

0.5 for 50% usage)

Definition at line 30 of file LoadMonitorMySQL.php.

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

includes/libs/rdbms/loadmonitor/LoadMonitorMySQL.php

Public Member Functions

Protected Member Functions

Private Attributes