),...) set. * - c) Jobs to update links for a single page (the job title) * These jobs need no extra fields set. * * @ingroup JobQueue */ class RefreshLinksJob extends Job { const PARSE_THRESHOLD_SEC = 1.0; function __construct( $title, $params = '' ) { parent::__construct( 'refreshLinks', $title, $params ); // Base backlink update jobs and per-title update jobs can be de-duplicated. // If template A changes twice before any jobs run, a clean queue will have: // (A base, A base) // The second job is ignored by the queue on insertion. // Suppose, many pages use template A, and that template itself uses template B. // An edit to both will first create two base jobs. A clean FIFO queue will have: // (A base, B base) // When these jobs run, the queue will have per-title and remnant partition jobs: // (titleX,titleY,titleZ,...,A remnant,titleM,titleN,titleO,...,B remnant) // Some these jobs will be the same, and will automatically be ignored by // the queue upon insertion. Some title jobs will run before the duplicate is // inserted, so the work will still be done twice in those cases. More titles // can be de-duplicated as the remnant jobs continue to be broken down. This // works best when $wgUpdateRowsPerJob, and either the pages have few backlinks // and/or the backlink sets for pages A and B are almost identical. $this->removeDuplicates = !isset( $params['range'] ) && ( !isset( $params['pages'] ) || count( $params['pages'] ) == 1 ); } function run() { global $wgUpdateRowsPerJob; // Job to update all (or a range of) backlink pages for a page if ( !empty( $this->params['recursive'] ) ) { // Carry over information for de-duplication $extraParams = $this->getRootJobParams(); // Avoid slave lag when fetching templates. // When the outermost job is run, we know that the caller that enqueued it must have // committed the relevant changes to the DB by now. At that point, record the master // position and pass it along as the job recursively breaks into smaller range jobs. // Hopefully, when leaf jobs are popped, the slaves will have reached that position. if ( isset( $this->params['masterPos'] ) ) { $extraParams['masterPos'] = $this->params['masterPos']; } elseif ( wfGetLB()->getServerCount() > 1 ) { $extraParams['masterPos'] = wfGetLB()->getMasterPos(); } else { $extraParams['masterPos'] = false; } // Convert this into no more than $wgUpdateRowsPerJob RefreshLinks per-title // jobs and possibly a recursive RefreshLinks job for the rest of the backlinks $jobs = BacklinkJobUtils::partitionBacklinkJob( $this, $wgUpdateRowsPerJob, 1, // job-per-title array( 'params' => $extraParams ) ); JobQueueGroup::singleton()->push( $jobs ); // Job to update link tables for for a set of titles } elseif ( isset( $this->params['pages'] ) ) { foreach ( $this->params['pages'] as $pageId => $nsAndKey ) { list( $ns, $dbKey ) = $nsAndKey; $this->runForTitle( Title::makeTitleSafe( $ns, $dbKey ) ); } // Job to update link tables for a given title } else { $this->runForTitle( $this->title ); } return true; } protected function runForTitle( Title $title = null ) { $linkCache = LinkCache::singleton(); $linkCache->clear(); if ( is_null( $title ) ) { $this->setLastError( "refreshLinks: Invalid title" ); return false; } // Wait for the DB of the current/next slave DB handle to catch up to the master. // This way, we get the correct page_latest for templates or files that just changed // milliseconds ago, having triggered this job to begin with. if ( isset( $this->params['masterPos'] ) && $this->params['masterPos'] !== false ) { wfGetLB()->waitFor( $this->params['masterPos'] ); } $page = WikiPage::factory( $title ); // Fetch the current revision... $revision = Revision::newFromTitle( $title, false, Revision::READ_NORMAL ); if ( !$revision ) { $this->setLastError( "refreshLinks: Article not found {$title->getPrefixedDBkey()}" ); return false; // XXX: what if it was just deleted? } $content = $revision->getContent( Revision::RAW ); if ( !$content ) { // If there is no content, pretend the content is empty $content = $revision->getContentHandler()->makeEmptyContent(); } $parserOutput = false; $parserOptions = $page->makeParserOptions( 'canonical' ); // If page_touched changed after this root job (with a good slave lag skew factor), // then it is likely that any views of the pages already resulted in re-parses which // are now in cache. This can be reused to avoid expensive parsing in some cases. if ( isset( $this->params['rootJobTimestamp'] ) ) { $skewedTimestamp = wfTimestamp( TS_UNIX, $this->params['rootJobTimestamp'] ) + 5; if ( $page->getLinksTimestamp() > wfTimestamp( TS_MW, $skewedTimestamp ) ) { // Something already updated the backlinks since this job was made return true; } if ( $page->getTouched() > wfTimestamp( TS_MW, $skewedTimestamp ) ) { $parserOutput = ParserCache::singleton()->getDirty( $page, $parserOptions ); if ( $parserOutput && $parserOutput->getCacheTime() <= $skewedTimestamp ) { $parserOutput = false; // too stale } } } // Fetch the current revision and parse it if necessary... if ( $parserOutput == false ) { $start = microtime( true ); // Revision ID must be passed to the parser output to get revision variables correct $parserOutput = $content->getParserOutput( $title, $revision->getId(), $parserOptions, false ); $ellapsed = microtime( true ) - $start; // If it took a long time to render, then save this back to the cache to avoid // wasted CPU by other apaches or job runners. We don't want to always save to // cache as this cause cause high cache I/O and LRU churn when a template changes. if ( $ellapsed >= self::PARSE_THRESHOLD_SEC && $page->isParserCacheUsed( $parserOptions, $revision->getId() ) && $parserOutput->isCacheable() ) { $ctime = wfTimestamp( TS_MW, (int)$start ); // cache time ParserCache::singleton()->save( $parserOutput, $page, $parserOptions, $ctime, $revision->getId() ); } } $updates = $content->getSecondaryDataUpdates( $title, null, false, $parserOutput ); DataUpdate::runUpdates( $updates ); InfoAction::invalidateCache( $title ); return true; } public function getDeduplicationInfo() { $info = parent::getDeduplicationInfo(); if ( is_array( $info['params'] ) ) { // Don't let highly unique "masterPos" values ruin duplicate detection unset( $info['params']['masterPos'] ); // For per-pages jobs, the job title is that of the template that changed // (or similar), so remove that since it ruins duplicate detection if ( isset( $info['pages'] ) ) { unset( $info['namespace'] ); unset( $info['title'] ); } } return $info; } public function workItemCount() { return isset( $this->params['pages'] ) ? count( $this->params['pages'] ) : 1; } }

) set. * - b) Jobs to update links for a set of pages (the job title is ignored). * These jobs have have (pages:(:(,),...) set. * - c) Jobs to update links for a single page (the job title) * These jobs need no extra fields set. * * @ingroup JobQueue */ class RefreshLinksJob extends Job { const PARSE_THRESHOLD_SEC = 1.0; function __construct( $title, $params = '' ) { parent::__construct( 'refreshLinks', $title, $params ); // Base backlink update jobs and per-title update jobs can be de-duplicated. // If template A changes twice before any jobs run, a clean queue will have: // (A base, A base) // The second job is ignored by the queue on insertion. // Suppose, many pages use template A, and that template itself uses template B. // An edit to both will first create two base jobs. A clean FIFO queue will have: // (A base, B base) // When these jobs run, the queue will have per-title and remnant partition jobs: // (titleX,titleY,titleZ,...,A remnant,titleM,titleN,titleO,...,B remnant) // Some these jobs will be the same, and will automatically be ignored by // the queue upon insertion. Some title jobs will run before the duplicate is // inserted, so the work will still be done twice in those cases. More titles // can be de-duplicated as the remnant jobs continue to be broken down. This // works best when $wgUpdateRowsPerJob, and either the pages have few backlinks // and/or the backlink sets for pages A and B are almost identical. $this->removeDuplicates = !isset( $params['range'] ) && ( !isset( $params['pages'] ) || count( $params['pages'] ) == 1 ); } function run() { global $wgUpdateRowsPerJob; // Job to update all (or a range of) backlink pages for a page if ( !empty( $this->params['recursive'] ) ) { // Carry over information for de-duplication $extraParams = $this->getRootJobParams(); // Avoid slave lag when fetching templates. // When the outermost job is run, we know that the caller that enqueued it must have // committed the relevant changes to the DB by now. At that point, record the master // position and pass it along as the job recursively breaks into smaller range jobs. // Hopefully, when leaf jobs are popped, the slaves will have reached that position. if ( isset( $this->params['masterPos'] ) ) { $extraParams['masterPos'] = $this->params['masterPos']; } elseif ( wfGetLB()->getServerCount() > 1 ) { $extraParams['masterPos'] = wfGetLB()->getMasterPos(); } else { $extraParams['masterPos'] = false; } // Convert this into no more than $wgUpdateRowsPerJob RefreshLinks per-title // jobs and possibly a recursive RefreshLinks job for the rest of the backlinks $jobs = BacklinkJobUtils::partitionBacklinkJob( $this, $wgUpdateRowsPerJob, 1, // job-per-title array( 'params' => $extraParams ) ); JobQueueGroup::singleton()->push( $jobs ); // Job to update link tables for for a set of titles } elseif ( isset( $this->params['pages'] ) ) { foreach ( $this->params['pages'] as $pageId => $nsAndKey ) { list( $ns, $dbKey ) = $nsAndKey; $this->runForTitle( Title::makeTitleSafe( $ns, $dbKey ) ); } // Job to update link tables for a given title } else { $this->runForTitle( $this->title ); } return true; } protected function runForTitle( Title $title = null ) { $linkCache = LinkCache::singleton(); $linkCache->clear(); if ( is_null( $title ) ) { $this->setLastError( "refreshLinks: Invalid title" ); return false; } // Wait for the DB of the current/next slave DB handle to catch up to the master. // This way, we get the correct page_latest for templates or files that just changed // milliseconds ago, having triggered this job to begin with. if ( isset( $this->params['masterPos'] ) && $this->params['masterPos'] !== false ) { wfGetLB()->waitFor( $this->params['masterPos'] ); } $page = WikiPage::factory( $title ); // Fetch the current revision... $revision = Revision::newFromTitle( $title, false, Revision::READ_NORMAL ); if ( !$revision ) { $this->setLastError( "refreshLinks: Article not found {$title->getPrefixedDBkey()}" ); return false; // XXX: what if it was just deleted? } $content = $revision->getContent( Revision::RAW ); if ( !$content ) { // If there is no content, pretend the content is empty $content = $revision->getContentHandler()->makeEmptyContent(); } $parserOutput = false; $parserOptions = $page->makeParserOptions( 'canonical' ); // If page_touched changed after this root job (with a good slave lag skew factor), // then it is likely that any views of the pages already resulted in re-parses which // are now in cache. This can be reused to avoid expensive parsing in some cases. if ( isset( $this->params['rootJobTimestamp'] ) ) { $skewedTimestamp = wfTimestamp( TS_UNIX, $this->params['rootJobTimestamp'] ) + 5; if ( $page->getLinksTimestamp() > wfTimestamp( TS_MW, $skewedTimestamp ) ) { // Something already updated the backlinks since this job was made return true; } if ( $page->getTouched() > wfTimestamp( TS_MW, $skewedTimestamp ) ) { $parserOutput = ParserCache::singleton()->getDirty( $page, $parserOptions ); if ( $parserOutput && $parserOutput->getCacheTime() <= $skewedTimestamp ) { $parserOutput = false; // too stale } } } // Fetch the current revision and parse it if necessary... if ( $parserOutput == false ) { $start = microtime( true ); // Revision ID must be passed to the parser output to get revision variables correct $parserOutput = $content->getParserOutput( $title, $revision->getId(), $parserOptions, false ); $ellapsed = microtime( true ) - $start; // If it took a long time to render, then save this back to the cache to avoid // wasted CPU by other apaches or job runners. We don't want to always save to // cache as this cause cause high cache I/O and LRU churn when a template changes. if ( $ellapsed >= self::PARSE_THRESHOLD_SEC && $page->isParserCacheUsed( $parserOptions, $revision->getId() ) && $parserOutput->isCacheable() ) { $ctime = wfTimestamp( TS_MW, (int)$start ); // cache time ParserCache::singleton()->save( $parserOutput, $page, $parserOptions, $ctime, $revision->getId() ); } } $updates = $content->getSecondaryDataUpdates( $title, null, false, $parserOutput ); DataUpdate::runUpdates( $updates ); InfoAction::invalidateCache( $title ); return true; } public function getDeduplicationInfo() { $info = parent::getDeduplicationInfo(); if ( is_array( $info['params'] ) ) { // Don't let highly unique "masterPos" values ruin duplicate detection unset( $info['params']['masterPos'] ); // For per-pages jobs, the job title is that of the template that changed // (or similar), so remove that since it ruins duplicate detection if ( isset( $info['pages'] ) ) { unset( $info['namespace'] ); unset( $info['title'] ); } } return $info; } public function workItemCount() { return isset( $this->params['pages'] ) ? count( $this->params['pages'] ) : 1; } }