485f66f174
Find: /isset\(\s*([^()]+?)\s*\)\s*\?\s*\1\s*:\s*/ Replace with: '\1 ?? ' (Everywhere except includes/PHPVersionCheck.php) (Then, manually fix some line length and indentation issues) Then manually reviewed the replacements for cases where confusing operator precedence would result in incorrect results (fixing those in I478db046a1cc162c6767003ce45c9b56270f3372). Change-Id: I33b421c8cb11cdd4ce896488c9ff5313f03a38cf
71 lines
2.2 KiB
PHP
71 lines
2.2 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Database
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*/
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namespace Wikimedia\Rdbms;
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use BagOStuff;
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use WANObjectCache;
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/**
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* Basic MySQL load monitor with no external dependencies
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* Uses memcached to cache the replication lag for a short time
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*
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* @ingroup Database
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*/
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class LoadMonitorMySQL extends LoadMonitor {
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/** @var float What buffer pool use ratio counts as "warm" (e.g. 0.5 for 50% usage) */
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private $warmCacheRatio;
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public function __construct(
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ILoadBalancer $lb, BagOStuff $srvCache, WANObjectCache $wCache, array $options = []
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) {
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parent::__construct( $lb, $srvCache, $wCache, $options );
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$this->warmCacheRatio = $options['warmCacheRatio'] ?? 0.0;
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}
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protected function getWeightScale( $index, IDatabase $conn = null ) {
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if ( !$conn ) {
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return parent::getWeightScale( $index, $conn );
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}
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$weight = 1.0;
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if ( $this->warmCacheRatio > 0 ) {
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$res = $conn->query( 'SHOW STATUS', __METHOD__ );
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$s = $res ? $conn->fetchObject( $res ) : false;
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if ( $s === false ) {
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$host = $this->parent->getServerName( $index );
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$this->replLogger->error( __METHOD__ . ": could not get status for $host" );
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} else {
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// https://dev.mysql.com/doc/refman/5.7/en/server-status-variables.html
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if ( $s->Innodb_buffer_pool_pages_total > 0 ) {
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$ratio = $s->Innodb_buffer_pool_pages_data / $s->Innodb_buffer_pool_pages_total;
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} else {
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$ratio = 1.0;
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}
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// Stop caring once $ratio >= $this->warmCacheRatio
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$weight *= min( $ratio / $this->warmCacheRatio, 1.0 );
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}
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}
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return $weight;
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}
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}
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