*/
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 DatabaseBase $conn
- * @param float $threshold
- */
- function postConnectionBackoff( $conn, $threshold );
-
/**
* Return an estimate of replication lag for each server
*
function scaleLoads( &$loads, $group = false, $wiki = false ) {
}
- function postConnectionBackoff( $conn, $threshold ) {
- }
-
/**
* @param array $serverIndexes
* @param string $wiki
return $times;
}
-
- /**
- * @param DatabaseBase|DatabaseMySQLBase $conn
- * @param int $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;
- }
- }
}