*
* @param LoadBalancer $parent
*/
- function __construct( $parent );
+ public function __construct( $parent );
/**
* Perform pre-connection load ratio adjustment.
* @param array $loads
- * @param string|bool $group the selected query group. Default: false
+ * @param string|bool $group The selected query group. Default: false
* @param string|bool $wiki Default: false
*/
- function scaleLoads( &$loads, $group = false, $wiki = false );
-
- /**
- * Perform post-connection backoff.
- *
- * If the connection is in overload, this should return a backoff factor
- * which will be used to control polling time. The number of threads
- * connected is a good measure.
- *
- * If there is no overload, zero can be returned.
- *
- * A threshold thread count is given, the concrete class may compare this
- * to the running thread count. The threshold may be false, which indicates
- * that the sysadmin has not configured this feature.
- *
- * @param $conn DatabaseBase
- * @param $threshold Float
- */
- function postConnectionBackoff( $conn, $threshold );
+ public function scaleLoads( &$loads, $group = false, $wiki = false );
/**
* Return an estimate of replication lag for each server
*
- * @param $serverIndexes
- * @param $wiki
+ * @param array $serverIndexes
+ * @param string $wiki
*
* @return array
*/
- function getLagTimes( $serverIndexes, $wiki );
+ public function getLagTimes( $serverIndexes, $wiki );
}
class LoadMonitorNull implements LoadMonitor {
- function __construct( $parent ) {
- }
-
- function scaleLoads( &$loads, $group = false, $wiki = false ) {
+ public function __construct( $parent ) {
}
- function postConnectionBackoff( $conn, $threshold ) {
+ public function scaleLoads( &$loads, $group = false, $wiki = false ) {
}
- /**
- * @param $serverIndexes
- * @param $wiki
- * @return array
- */
- function getLagTimes( $serverIndexes, $wiki ) {
+ public function getLagTimes( $serverIndexes, $wiki ) {
return array_fill_keys( $serverIndexes, 0 );
}
}
* @ingroup Database
*/
class LoadMonitorMySQL implements LoadMonitor {
- /**
- * @var LoadBalancer
- */
+ /** @var LoadBalancer */
public $parent;
- /**
- * @param LoadBalancer $parent
- */
- function __construct( $parent ) {
+ public function __construct( $parent ) {
$this->parent = $parent;
}
- /**
- * @param $loads
- * @param $group bool
- * @param $wiki bool
- */
- function scaleLoads( &$loads, $group = false, $wiki = false ) {
+ public function scaleLoads( &$loads, $group = false, $wiki = false ) {
}
- /**
- * @param $serverIndexes
- * @param $wiki
- * @return array
- */
- function getLagTimes( $serverIndexes, $wiki ) {
+ public function getLagTimes( $serverIndexes, $wiki ) {
if ( count( $serverIndexes ) == 1 && reset( $serverIndexes ) == 0 ) {
// Single server only, just return zero without caching
return array( 0 => 0 );
}
- wfProfileIn( __METHOD__ );
+ $section = new ProfileSection( __METHOD__ );
+
$expiry = 5;
$requestRate = 10;
$chance = max( 0, ( $expiry - $elapsed ) * $requestRate );
if ( mt_rand( 0, $chance ) != 0 ) {
unset( $times['timestamp'] ); // hide from caller
- wfProfileOut( __METHOD__ );
return $times;
}
} elseif ( is_array( $times ) ) {
# Could not acquire lock but an old cache exists, so use it
unset( $times['timestamp'] ); // hide from caller
- wfProfileOut( __METHOD__ );
return $times;
}
$wgMemc->set( $memcKey, $times, $expiry + 10 );
unset( $times['timestamp'] ); // hide from caller
- wfProfileOut( __METHOD__ );
-
return $times;
}
-
- /**
- * @param $conn DatabaseBase
- * @param $threshold
- * @return int
- */
- function postConnectionBackoff( $conn, $threshold ) {
- if ( !$threshold ) {
- return 0;
- }
- $status = $conn->getMysqlStatus( "Thread%" );
- if ( $status['Threads_running'] > $threshold ) {
- $server = $conn->getProperty( 'mServer' );
- wfLogDBError( "LB backoff from $server - Threads_running = {$status['Threads_running']}\n" );
-
- return $status['Threads_connected'];
- } else {
- return 0;
- }
- }
}