X-Git-Url: https://scripts.mit.edu/gitweb/autoinstallsdev/mediawiki.git/blobdiff_plain/dc9cc5d707f5a612938cc9371614cc41c328fda2..6932310fd58ebef145fa01eb76edf7150284d8ea:/includes/db/LoadBalancer.php diff --git a/includes/db/LoadBalancer.php b/includes/db/LoadBalancer.php deleted file mode 100644 index 0b8ef05a..00000000 --- a/includes/db/LoadBalancer.php +++ /dev/null @@ -1,915 +0,0 @@ -mServers = $params['servers']; - - if ( isset( $params['failFunction'] ) ) { - $this->mFailFunction = $params['failFunction']; - } else { - $this->mFailFunction = false; - } - if ( isset( $params['waitTimeout'] ) ) { - $this->mWaitTimeout = $params['waitTimeout']; - } else { - $this->mWaitTimeout = 10; - } - - $this->mReadIndex = -1; - $this->mWriteIndex = -1; - $this->mConns = array( - 'local' => array(), - 'foreignUsed' => array(), - 'foreignFree' => array() ); - $this->mLoads = array(); - $this->mWaitForPos = false; - $this->mLaggedSlaveMode = false; - $this->mErrorConnection = false; - $this->mAllowLag = false; - $this->mLoadMonitorClass = isset( $params['loadMonitor'] ) - ? $params['loadMonitor'] : 'LoadMonitor_MySQL'; - - foreach( $params['servers'] as $i => $server ) { - $this->mLoads[$i] = $server['load']; - if ( isset( $server['groupLoads'] ) ) { - foreach ( $server['groupLoads'] as $group => $ratio ) { - if ( !isset( $this->mGroupLoads[$group] ) ) { - $this->mGroupLoads[$group] = array(); - } - $this->mGroupLoads[$group][$i] = $ratio; - } - } - } - } - - static function newFromParams( $servers, $failFunction = false, $waitTimeout = 10 ) - { - return new LoadBalancer( $servers, $failFunction, $waitTimeout ); - } - - /** - * Get a LoadMonitor instance - */ - function getLoadMonitor() { - if ( !isset( $this->mLoadMonitor ) ) { - $class = $this->mLoadMonitorClass; - $this->mLoadMonitor = new $class( $this ); - } - return $this->mLoadMonitor; - } - - /** - * Get or set arbitrary data used by the parent object, usually an LBFactory - */ - function parentInfo( $x = null ) { - return wfSetVar( $this->mParentInfo, $x ); - } - - /** - * Given an array of non-normalised probabilities, this function will select - * an element and return the appropriate key - */ - function pickRandom( $weights ) - { - if ( !is_array( $weights ) || count( $weights ) == 0 ) { - return false; - } - - $sum = array_sum( $weights ); - if ( $sum == 0 ) { - # No loads on any of them - # In previous versions, this triggered an unweighted random selection, - # but this feature has been removed as of April 2006 to allow for strict - # separation of query groups. - return false; - } - $max = mt_getrandmax(); - $rand = mt_rand(0, $max) / $max * $sum; - - $sum = 0; - foreach ( $weights as $i => $w ) { - $sum += $w; - if ( $sum >= $rand ) { - break; - } - } - return $i; - } - - function getRandomNonLagged( $loads, $wiki = false ) { - # Unset excessively lagged servers - $lags = $this->getLagTimes( $wiki ); - foreach ( $lags as $i => $lag ) { - if ( $i != 0 && isset( $this->mServers[$i]['max lag'] ) ) { - if ( $lag === false ) { - wfDebug( "Server #$i is not replicating\n" ); - unset( $loads[$i] ); - } elseif ( $lag > $this->mServers[$i]['max lag'] ) { - wfDebug( "Server #$i is excessively lagged ($lag seconds)\n" ); - unset( $loads[$i] ); - } - } - } - - # Find out if all the slaves with non-zero load are lagged - $sum = 0; - foreach ( $loads as $load ) { - $sum += $load; - } - if ( $sum == 0 ) { - # No appropriate DB servers except maybe the master and some slaves with zero load - # Do NOT use the master - # Instead, this function will return false, triggering read-only mode, - # and a lagged slave will be used instead. - return false; - } - - if ( count( $loads ) == 0 ) { - return false; - } - - #wfDebugLog( 'connect', var_export( $loads, true ) ); - - # Return a random representative of the remainder - return $this->pickRandom( $loads ); - } - - /** - * Get the index of the reader connection, which may be a slave - * This takes into account load ratios and lag times. It should - * always return a consistent index during a given invocation - * - * Side effect: opens connections to databases - */ - function getReaderIndex( $group = false, $wiki = false ) { - global $wgReadOnly, $wgDBClusterTimeout, $wgDBAvgStatusPoll, $wgDBtype; - - # FIXME: For now, only go through all this for mysql databases - if ($wgDBtype != 'mysql') { - return $this->getWriterIndex(); - } - - if ( count( $this->mServers ) == 1 ) { - # Skip the load balancing if there's only one server - return 0; - } elseif ( $group === false and $this->mReadIndex >= 0 ) { - # Shortcut if generic reader exists already - return $this->mReadIndex; - } - - wfProfileIn( __METHOD__ ); - - $totalElapsed = 0; - - # convert from seconds to microseconds - $timeout = $wgDBClusterTimeout * 1e6; - - # Find the relevant load array - if ( $group !== false ) { - if ( isset( $this->mGroupLoads[$group] ) ) { - $nonErrorLoads = $this->mGroupLoads[$group]; - } else { - # No loads for this group, return false and the caller can use some other group - wfDebug( __METHOD__.": no loads for group $group\n" ); - wfProfileOut( __METHOD__ ); - return false; - } - } else { - $nonErrorLoads = $this->mLoads; - } - - if ( !$nonErrorLoads ) { - throw new MWException( "Empty server array given to LoadBalancer" ); - } - - # Scale the configured load ratios according to the dynamic load (if the load monitor supports it) - $this->getLoadMonitor()->scaleLoads( $nonErrorLoads, $group, $wiki ); - - $i = false; - $found = false; - $laggedSlaveMode = false; - - # First try quickly looking through the available servers for a server that - # meets our criteria - do { - $totalThreadsConnected = 0; - $overloadedServers = 0; - $currentLoads = $nonErrorLoads; - while ( count( $currentLoads ) ) { - if ( $wgReadOnly || $this->mAllowLagged || $laggedSlaveMode ) { - $i = $this->pickRandom( $currentLoads ); - } else { - $i = $this->getRandomNonLagged( $currentLoads, $wiki ); - if ( $i === false && count( $currentLoads ) != 0 ) { - # All slaves lagged. Switch to read-only mode - $wgReadOnly = wfMsgNoDBForContent( 'readonly_lag' ); - $i = $this->pickRandom( $currentLoads ); - $laggedSlaveMode = true; - } - } - - if ( $i === false ) { - # pickRandom() returned false - # This is permanent and means the configuration or the load monitor - # wants us to return false. - wfDebugLog( 'connect', __METHOD__.": pickRandom() returned false\n" ); - wfProfileOut( __METHOD__ ); - return false; - } - - wfDebugLog( 'connect', __METHOD__.": Using reader #$i: {$this->mServers[$i]['host']}...\n" ); - $conn = $this->openConnection( $i, $wiki ); - - if ( !$conn ) { - wfDebugLog( 'connect', __METHOD__.": Failed connecting to $i/$wiki\n" ); - unset( $nonErrorLoads[$i] ); - unset( $currentLoads[$i] ); - continue; - } - - // Perform post-connection backoff - $threshold = isset( $this->mServers[$i]['max threads'] ) - ? $this->mServers[$i]['max threads'] : false; - $backoff = $this->getLoadMonitor()->postConnectionBackoff( $conn, $threshold ); - - // Decrement reference counter, we are finished with this connection. - // It will be incremented for the caller later. - if ( $wiki !== false ) { - $this->reuseConnection( $conn ); - } - - if ( $backoff ) { - # Post-connection overload, don't use this server for now - $totalThreadsConnected += $backoff; - $overloadedServers++; - unset( $currentLoads[$i] ); - } else { - # Return this server - break 2; - } - } - - # No server found yet - $i = false; - - # If all servers were down, quit now - if ( !count( $nonErrorLoads ) ) { - wfDebugLog( 'connect', "All servers down\n" ); - break; - } - - # Some servers must have been overloaded - if ( $overloadedServers == 0 ) { - throw new MWException( __METHOD__.": unexpectedly found no overloaded servers" ); - } - # Back off for a while - # Scale the sleep time by the number of connected threads, to produce a - # roughly constant global poll rate - $avgThreads = $totalThreadsConnected / $overloadedServers; - $totalElapsed += $this->sleep( $wgDBAvgStatusPoll * $avgThreads ); - } while ( $totalElapsed < $timeout ); - - if ( $totalElapsed >= $timeout ) { - wfDebugLog( 'connect', "All servers busy\n" ); - $this->mErrorConnection = false; - $this->mLastError = 'All servers busy'; - } - - if ( $i !== false ) { - # Slave connection successful - # Wait for the session master pos for a short time - if ( $this->mWaitForPos && $i > 0 ) { - if ( !$this->doWait( $i ) ) { - $this->mServers[$i]['slave pos'] = $conn->getSlavePos(); - } - } - if ( $this->mReadIndex <=0 && $this->mLoads[$i]>0 && $i !== false ) { - $this->mReadIndex = $i; - } - } - wfProfileOut( __METHOD__ ); - return $i; - } - - /** - * Wait for a specified number of microseconds, and return the period waited - */ - function sleep( $t ) { - wfProfileIn( __METHOD__ ); - wfDebug( __METHOD__.": waiting $t us\n" ); - usleep( $t ); - wfProfileOut( __METHOD__ ); - return $t; - } - - /** - * Get a random server to use in a query group - * @deprecated use getReaderIndex - */ - function getGroupIndex( $group ) { - return $this->getReaderIndex( $group ); - } - - /** - * Set the master wait position - * If a DB_SLAVE connection has been opened already, waits - * Otherwise sets a variable telling it to wait if such a connection is opened - */ - public function waitFor( $pos ) { - wfProfileIn( __METHOD__ ); - $this->mWaitForPos = $pos; - $i = $this->mReadIndex; - - if ( $i > 0 ) { - if ( !$this->doWait( $i ) ) { - $this->mServers[$i]['slave pos'] = $this->getAnyOpenConnection( $i )->getSlavePos(); - $this->mLaggedSlaveMode = true; - } - } - wfProfileOut( __METHOD__ ); - } - - /** - * Get any open connection to a given server index, local or foreign - * Returns false if there is no connection open - */ - function getAnyOpenConnection( $i ) { - foreach ( $this->mConns as $type => $conns ) { - if ( !empty( $conns[$i] ) ) { - return reset( $conns[$i] ); - } - } - return false; - } - - /** - * Wait for a given slave to catch up to the master pos stored in $this - */ - function doWait( $index ) { - # Find a connection to wait on - $conn = $this->getAnyOpenConnection( $index ); - if ( !$conn ) { - wfDebug( __METHOD__ . ": no connection open\n" ); - return false; - } - - wfDebug( __METHOD__.": Waiting for slave #$index to catch up...\n" ); - $result = $conn->masterPosWait( $this->mWaitForPos, $this->mWaitTimeout ); - - if ( $result == -1 || is_null( $result ) ) { - # Timed out waiting for slave, use master instead - wfDebug( __METHOD__.": Timed out waiting for slave #$index pos {$this->mWaitForPos}\n" ); - return false; - } else { - wfDebug( __METHOD__.": Done\n" ); - return true; - } - } - - /** - * Get a connection by index - * This is the main entry point for this class. - * @param int $i Database - * @param array $groups Query groups - * @param string $wiki Wiki ID - */ - public function &getConnection( $i, $groups = array(), $wiki = false ) { - global $wgDBtype; - wfProfileIn( __METHOD__ ); - - if ( $i == DB_LAST ) { - throw new MWException( 'Attempt to call ' . __METHOD__ . ' with deprecated server index DB_LAST' ); - } elseif ( $i === null || $i === false ) { - throw new MWException( 'Attempt to call ' . __METHOD__ . ' with invalid server index' ); - } - - if ( $wiki === wfWikiID() ) { - $wiki = false; - } - - # Query groups - if ( $i == DB_MASTER ) { - $i = $this->getWriterIndex(); - } elseif ( !is_array( $groups ) ) { - $groupIndex = $this->getReaderIndex( $groups, $wiki ); - if ( $groupIndex !== false ) { - $serverName = $this->getServerName( $groupIndex ); - wfDebug( __METHOD__.": using server $serverName for group $groups\n" ); - $i = $groupIndex; - } - } else { - foreach ( $groups as $group ) { - $groupIndex = $this->getReaderIndex( $group, $wiki ); - if ( $groupIndex !== false ) { - $serverName = $this->getServerName( $groupIndex ); - wfDebug( __METHOD__.": using server $serverName for group $group\n" ); - $i = $groupIndex; - break; - } - } - } - - # Operation-based index - if ( $i == DB_SLAVE ) { - $i = $this->getReaderIndex( false, $wiki ); - # Couldn't find a working server in getReaderIndex()? - if ( $i === false ) { - $this->mLastError = 'No working slave server: ' . $this->mLastError; - $this->reportConnectionError( $this->mErrorConnection ); - return false; - } - } - - # Now we have an explicit index into the servers array - $conn = $this->openConnection( $i, $wiki ); - if ( !$conn ) { - $this->reportConnectionError( $this->mErrorConnection ); - } - - wfProfileOut( __METHOD__ ); - return $conn; - } - - /** - * Mark a foreign connection as being available for reuse under a different - * DB name or prefix. This mechanism is reference-counted, and must be called - * the same number of times as getConnection() to work. - */ - public function reuseConnection( $conn ) { - $serverIndex = $conn->getLBInfo('serverIndex'); - $refCount = $conn->getLBInfo('foreignPoolRefCount'); - $dbName = $conn->getDBname(); - $prefix = $conn->tablePrefix(); - if ( strval( $prefix ) !== '' ) { - $wiki = "$dbName-$prefix"; - } else { - $wiki = $dbName; - } - if ( $serverIndex === null || $refCount === null ) { - wfDebug( __METHOD__.": this connection was not opened as a foreign connection\n" ); - /** - * This can happen in code like: - * foreach ( $dbs as $db ) { - * $conn = $lb->getConnection( DB_SLAVE, array(), $db ); - * ... - * $lb->reuseConnection( $conn ); - * } - * When a connection to the local DB is opened in this way, reuseConnection() - * should be ignored - */ - return; - } - if ( $this->mConns['foreignUsed'][$serverIndex][$wiki] !== $conn ) { - throw new MWException( __METHOD__.": connection not found, has the connection been freed already?" ); - } - $conn->setLBInfo( 'foreignPoolRefCount', --$refCount ); - if ( $refCount <= 0 ) { - $this->mConns['foreignFree'][$serverIndex][$wiki] = $conn; - unset( $this->mConns['foreignUsed'][$serverIndex][$wiki] ); - wfDebug( __METHOD__.": freed connection $serverIndex/$wiki\n" ); - } else { - wfDebug( __METHOD__.": reference count for $serverIndex/$wiki reduced to $refCount\n" ); - } - } - - /** - * Open a connection to the server given by the specified index - * Index must be an actual index into the array. - * If the server is already open, returns it. - * - * On error, returns false, and the connection which caused the - * error will be available via $this->mErrorConnection. - * - * @param integer $i Server index - * @param string $wiki Wiki ID to open - * @return Database - * - * @access private - */ - function openConnection( $i, $wiki = false ) { - wfProfileIn( __METHOD__ ); - if ( $wiki !== false ) { - $conn = $this->openForeignConnection( $i, $wiki ); - wfProfileOut( __METHOD__); - return $conn; - } - if ( isset( $this->mConns['local'][$i][0] ) ) { - $conn = $this->mConns['local'][$i][0]; - } else { - $server = $this->mServers[$i]; - $server['serverIndex'] = $i; - $conn = $this->reallyOpenConnection( $server, false ); - if ( $conn->isOpen() ) { - $this->mConns['local'][$i][0] = $conn; - } else { - wfDebug( "Failed to connect to database $i at {$this->mServers[$i]['host']}\n" ); - $this->mErrorConnection = $conn; - $conn = false; - } - } - wfProfileOut( __METHOD__ ); - return $conn; - } - - /** - * Open a connection to a foreign DB, or return one if it is already open. - * - * Increments a reference count on the returned connection which locks the - * connection to the requested wiki. This reference count can be - * decremented by calling reuseConnection(). - * - * If a connection is open to the appropriate server already, but with the wrong - * database, it will be switched to the right database and returned, as long as - * it has been freed first with reuseConnection(). - * - * On error, returns false, and the connection which caused the - * error will be available via $this->mErrorConnection. - * - * @param integer $i Server index - * @param string $wiki Wiki ID to open - * @return Database - */ - function openForeignConnection( $i, $wiki ) { - wfProfileIn(__METHOD__); - list( $dbName, $prefix ) = wfSplitWikiID( $wiki ); - if ( isset( $this->mConns['foreignUsed'][$i][$wiki] ) ) { - // Reuse an already-used connection - $conn = $this->mConns['foreignUsed'][$i][$wiki]; - wfDebug( __METHOD__.": reusing connection $i/$wiki\n" ); - } elseif ( isset( $this->mConns['foreignFree'][$i][$wiki] ) ) { - // Reuse a free connection for the same wiki - $conn = $this->mConns['foreignFree'][$i][$wiki]; - unset( $this->mConns['foreignFree'][$i][$wiki] ); - $this->mConns['foreignUsed'][$i][$wiki] = $conn; - wfDebug( __METHOD__.": reusing free connection $i/$wiki\n" ); - } elseif ( !empty( $this->mConns['foreignFree'][$i] ) ) { - // Reuse a connection from another wiki - $conn = reset( $this->mConns['foreignFree'][$i] ); - $oldWiki = key( $this->mConns['foreignFree'][$i] ); - - if ( !$conn->selectDB( $dbName ) ) { - $this->mLastError = "Error selecting database $dbName on server " . - $conn->getServer() . " from client host " . wfHostname() . "\n"; - $this->mErrorConnection = $conn; - $conn = false; - } else { - $conn->tablePrefix( $prefix ); - unset( $this->mConns['foreignFree'][$i][$oldWiki] ); - $this->mConns['foreignUsed'][$i][$wiki] = $conn; - wfDebug( __METHOD__.": reusing free connection from $oldWiki for $wiki\n" ); - } - } else { - // Open a new connection - $server = $this->mServers[$i]; - $server['serverIndex'] = $i; - $server['foreignPoolRefCount'] = 0; - $conn = $this->reallyOpenConnection( $server, $dbName ); - if ( !$conn->isOpen() ) { - wfDebug( __METHOD__.": error opening connection for $i/$wiki\n" ); - $this->mErrorConnection = $conn; - $conn = false; - } else { - $conn->tablePrefix( $prefix ); - $this->mConns['foreignUsed'][$i][$wiki] = $conn; - wfDebug( __METHOD__.": opened new connection for $i/$wiki\n" ); - } - } - - // Increment reference count - if ( $conn ) { - $refCount = $conn->getLBInfo( 'foreignPoolRefCount' ); - $conn->setLBInfo( 'foreignPoolRefCount', $refCount + 1 ); - } - wfProfileOut(__METHOD__); - return $conn; - } - - /** - * Test if the specified index represents an open connection - * @access private - */ - function isOpen( $index ) { - if( !is_integer( $index ) ) { - return false; - } - return (bool)$this->getAnyOpenConnection( $index ); - } - - /** - * Really opens a connection. Uncached. - * Returns a Database object whether or not the connection was successful. - * @access private - */ - function reallyOpenConnection( $server, $dbNameOverride = false ) { - if( !is_array( $server ) ) { - throw new MWException( 'You must update your load-balancing configuration. See DefaultSettings.php entry for $wgDBservers.' ); - } - - extract( $server ); - if ( $dbNameOverride !== false ) { - $dbname = $dbNameOverride; - } - - # Get class for this database type - $class = 'Database' . ucfirst( $type ); - - # Create object - wfDebug( "Connecting to $host $dbname...\n" ); - $db = new $class( $host, $user, $password, $dbname, 1, $flags ); - if ( $db->isOpen() ) { - wfDebug( "Connected\n" ); - } else { - wfDebug( "Failed\n" ); - } - $db->setLBInfo( $server ); - if ( isset( $server['fakeSlaveLag'] ) ) { - $db->setFakeSlaveLag( $server['fakeSlaveLag'] ); - } - if ( isset( $server['fakeMaster'] ) ) { - $db->setFakeMaster( true ); - } - return $db; - } - - function reportConnectionError( &$conn ) { - wfProfileIn( __METHOD__ ); - - if ( !is_object( $conn ) ) { - // No last connection, probably due to all servers being too busy - wfLogDBError( "LB failure with no last connection\n" ); - $conn = new Database; - if ( $this->mFailFunction ) { - $conn->failFunction( $this->mFailFunction ); - $conn->reportConnectionError( $this->mLastError ); - } else { - // If all servers were busy, mLastError will contain something sensible - throw new DBConnectionError( $conn, $this->mLastError ); - } - } else { - if ( $this->mFailFunction ) { - $conn->failFunction( $this->mFailFunction ); - } else { - $conn->failFunction( false ); - } - $server = $conn->getProperty( 'mServer' ); - wfLogDBError( "Connection error: {$this->mLastError} ({$server})\n" ); - $conn->reportConnectionError( "{$this->mLastError} ({$server})" ); - } - wfProfileOut( __METHOD__ ); - } - - function getWriterIndex() { - return 0; - } - - /** - * Returns true if the specified index is a valid server index - */ - function haveIndex( $i ) { - return array_key_exists( $i, $this->mServers ); - } - - /** - * Returns true if the specified index is valid and has non-zero load - */ - function isNonZeroLoad( $i ) { - return array_key_exists( $i, $this->mServers ) && $this->mLoads[$i] != 0; - } - - /** - * Get the number of defined servers (not the number of open connections) - */ - function getServerCount() { - return count( $this->mServers ); - } - - /** - * Get the host name or IP address of the server with the specified index - * Prefer a readable name if available. - */ - function getServerName( $i ) { - if ( isset( $this->mServers[$i]['hostName'] ) ) { - return $this->mServers[$i]['hostName']; - } elseif ( isset( $this->mServers[$i]['host'] ) ) { - return $this->mServers[$i]['host']; - } else { - return ''; - } - } - - /** - * Return the server info structure for a given index, or false if the index is invalid. - */ - function getServerInfo( $i ) { - if ( isset( $this->mServers[$i] ) ) { - return $this->mServers[$i]; - } else { - return false; - } - } - - /** - * Get the current master position for chronology control purposes - * @return mixed - */ - function getMasterPos() { - # If this entire request was served from a slave without opening a connection to the - # master (however unlikely that may be), then we can fetch the position from the slave. - $masterConn = $this->getAnyOpenConnection( 0 ); - if ( !$masterConn ) { - for ( $i = 1; $i < count( $this->mServers ); $i++ ) { - $conn = $this->getAnyOpenConnection( $i ); - if ( $conn ) { - wfDebug( "Master pos fetched from slave\n" ); - return $conn->getSlavePos(); - } - } - } else { - wfDebug( "Master pos fetched from master\n" ); - return $masterConn->getMasterPos(); - } - return false; - } - - /** - * Close all open connections - */ - function closeAll() { - foreach ( $this->mConns as $conns2 ) { - foreach ( $conns2 as $conns3 ) { - foreach ( $conns3 as $conn ) { - $conn->close(); - } - } - } - $this->mConns = array( - 'local' => array(), - 'foreignFree' => array(), - 'foreignUsed' => array(), - ); - } - - /** - * Close a connection - * Using this function makes sure the LoadBalancer knows the connection is closed. - * If you use $conn->close() directly, the load balancer won't update its state. - */ - function closeConnecton( $conn ) { - $done = false; - foreach ( $this->mConns as $i1 => $conns2 ) { - foreach ( $conns2 as $i2 => $conns3 ) { - foreach ( $conns3 as $i3 => $candidateConn ) { - if ( $conn === $candidateConn ) { - $conn->close(); - unset( $this->mConns[$i1][$i2][$i3] ); - $done = true; - break; - } - } - } - } - if ( !$done ) { - $conn->close(); - } - } - - /** - * Commit transactions on all open connections - */ - function commitAll() { - foreach ( $this->mConns as $conns2 ) { - foreach ( $conns2 as $conns3 ) { - foreach ( $conns3 as $conn ) { - $conn->immediateCommit(); - } - } - } - } - - /* Issue COMMIT only on master, only if queries were done on connection */ - function commitMasterChanges() { - // Always 0, but who knows.. :) - $masterIndex = $this->getWriterIndex(); - foreach ( $this->mConns as $type => $conns2 ) { - if ( empty( $conns2[$masterIndex] ) ) { - continue; - } - foreach ( $conns2[$masterIndex] as $conn ) { - if ( $conn->doneWrites() ) { - $conn->commit(); - } - } - } - } - - function waitTimeout( $value = NULL ) { - return wfSetVar( $this->mWaitTimeout, $value ); - } - - function getLaggedSlaveMode() { - return $this->mLaggedSlaveMode; - } - - /* Disables/enables lag checks */ - function allowLagged($mode=null) { - if ($mode===null) - return $this->mAllowLagged; - $this->mAllowLagged=$mode; - } - - function pingAll() { - $success = true; - foreach ( $this->mConns as $conns2 ) { - foreach ( $conns2 as $conns3 ) { - foreach ( $conns3 as $conn ) { - if ( !$conn->ping() ) { - $success = false; - } - } - } - } - return $success; - } - - /** - * Call a function with each open connection object - */ - function forEachOpenConnection( $callback, $params = array() ) { - foreach ( $this->mConns as $conns2 ) { - foreach ( $conns2 as $conns3 ) { - foreach ( $conns3 as $conn ) { - $mergedParams = array_merge( array( $conn ), $params ); - call_user_func_array( $callback, $mergedParams ); - } - } - } - } - - /** - * Get the hostname and lag time of the most-lagged slave. - * This is useful for maintenance scripts that need to throttle their updates. - * May attempt to open connections to slaves on the default DB. - */ - function getMaxLag() { - $maxLag = -1; - $host = ''; - foreach ( $this->mServers as $i => $conn ) { - $conn = $this->getAnyOpenConnection( $i ); - if ( !$conn ) { - $conn = $this->openConnection( $i ); - } - if ( !$conn ) { - continue; - } - $lag = $conn->getLag(); - if ( $lag > $maxLag ) { - $maxLag = $lag; - $host = $this->mServers[$i]['host']; - } - } - return array( $host, $maxLag ); - } - - /** - * Get lag time for each server - * Results are cached for a short time in memcached, and indefinitely in the process cache - */ - function getLagTimes( $wiki = false ) { - # Try process cache - if ( isset( $this->mLagTimes ) ) { - return $this->mLagTimes; - } - # No, send the request to the load monitor - $this->mLagTimes = $this->getLoadMonitor()->getLagTimes( array_keys( $this->mServers ), $wiki ); - return $this->mLagTimes; - } -}