Merge "Allow stop characters as quoted attribute delimiters"

[lhc/web/wiklou.git] / includes / db / LoadMonitor.php

diff --git a/includes/db/LoadMonitor.php b/includes/db/LoadMonitor.php
index 01d2f95..4975ea1 100644 (file)
--- a/includes/db/LoadMonitor.php
+++ b/includes/db/LoadMonitor.php
@@ -64,108 +64,3 @@ class LoadMonitorNull implements LoadMonitor {
                return array_fill_keys( $serverIndexes, 0 );
        }
 }
-
-/**
- * Basic MySQL load monitor with no external dependencies
- * Uses memcached to cache the replication lag for a short time
- *
- * @ingroup Database
- */
-class LoadMonitorMySQL implements LoadMonitor {
-       /** @var LoadBalancer */
-       public $parent;
-       /** @var BagOStuff */
-       protected $srvCache;
-       /** @var BagOStuff */
-       protected $mainCache;
-
-       public function __construct( $parent ) {
-               global $wgMemc;
-
-               $this->parent = $parent;
-
-               $this->srvCache = ObjectCache::newAccelerator( array(), 'hash' );
-               $this->mainCache = $wgMemc ?: wfGetMainCache();
-       }
-
-       public function scaleLoads( &$loads, $group = false, $wiki = false ) {
-       }
-
-       public function getLagTimes( $serverIndexes, $wiki ) {
-               if ( count( $serverIndexes ) == 1 && reset( $serverIndexes ) == 0 ) {
-                       # Single server only, just return zero without caching
-                       return array( 0 => 0 );
-               }
-
-               $key = $this->getLagTimeCacheKey();
-               # Randomize TTLs to reduce stampedes (4.0 - 5.0 sec)
-               $ttl = mt_rand( 4e6, 5e6 ) / 1e6;
-               # Keep keys around longer as fallbacks
-               $staleTTL = 60;
-
-               # (a) Check the local APC cache
-               $value = $this->srvCache->get( $key );
-               if ( $value && $value['timestamp'] > ( microtime( true ) - $ttl ) ) {
-                       wfDebugLog( 'replication',  __FUNCTION__ . ": got lag times ($key) from local cache" );
-                       return $value['lagTimes']; // cache hit
-               }
-               $staleValue = $value ?: false;
-
-               # (b) Check the shared cache and backfill APC
-               $value = $this->mainCache->get( $key );
-               if ( $value && $value['timestamp'] > ( microtime( true ) - $ttl ) ) {
-                       $this->srvCache->set( $key, $value, $staleTTL );
-                       wfDebugLog( 'replication',  __FUNCTION__ . ": got lag times ($key) from main cache" );
-
-                       return $value['lagTimes']; // cache hit
-               }
-               $staleValue = $value ?: $staleValue;
-
-               # (c) Cache key missing or expired; regenerate and backfill
-               if ( $this->mainCache->lock( $key, 0, 10 ) ) {
-                       # Let this process alone update the cache value
-                       $cache = $this->mainCache;
-                       $unlocker = new ScopedCallback( function () use ( $cache, $key ) {
-                               $cache->unlock( $key );
-                       } );
-               } elseif ( $staleValue ) {
-                       # Could not acquire lock but an old cache exists, so use it
-                       return $value['lagTimes'];
-               }
-
-               $lagTimes = array();
-               foreach ( $serverIndexes as $i ) {
-                       if ( $i == 0 ) { # Master
-                               $lagTimes[$i] = 0;
-                       } elseif ( false !== ( $conn = $this->parent->getAnyOpenConnection( $i ) ) ) {
-                               $lagTimes[$i] = $conn->getLag();
-                       } elseif ( false !== ( $conn = $this->parent->openConnection( $i, $wiki ) ) ) {
-                               $lagTimes[$i] = $conn->getLag();
-                               # Close the connection to avoid sleeper connections piling up.
-                               # Note that the caller will pick one of these DBs and reconnect,
-                               # which is slightly inefficient, but this only matters for the lag
-                               # time cache miss cache, which is far less common that cache hits.
-                               $this->parent->closeConnection( $conn );
-                       }
-               }
-
-               # Add a timestamp key so we know when it was cached
-               $value = array( 'lagTimes' => $lagTimes, 'timestamp' => microtime( true ) );
-               $this->mainCache->set( $key, $value, $staleTTL );
-               $this->srvCache->set( $key, $value, $staleTTL );
-               wfDebugLog( 'replication',  __FUNCTION__ . ": re-calculated lag times ($key)" );
-
-               return $value['lagTimes'];
-       }
-
-       public function clearCaches() {
-               $key = $this->getLagTimeCacheKey();
-               $this->srvCache->delete( $key );
-               $this->mainCache->delete( $key );
-       }
-
-       private function getLagTimeCacheKey() {
-               # Lag is per-server, not per-DB, so key on the master DB name
-               return wfGlobalCacheKey( 'lag-times', $this->parent->getServerName( 0 ) );
-       }
-}