--- /dev/null
+<?php
+/**
+ * Resets the page_random field for articles in the provided time range.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Maintenance
+ */
+
+require_once __DIR__ . '/Maintenance.php';
+
+/**
+ * Maintenance script that resets page_random over a time range.
+ *
+ * @ingroup Maintenance
+ */
+class ResetPageRandom extends Maintenance {
+ public function __construct() {
+ parent::__construct();
+ $this->addDescription( 'Reset the page_random for articles within given date range' );
+ $this->addOption( 'from',
+ 'From date range selector to select articles to update, ex: 20041011000000' );
+ $this->addOption( 'to',
+ 'To date range selector to select articles to update, ex: 20050708000000' );
+ $this->addOption( 'dry', 'Do not update column' );
+ $this->addOption( 'batch-start',
+ 'Optional: Use when you need to restart the reset process from a given page ID offset'
+ . ' in case a previous reset failed or was stopped'
+ );
+ // Initialize batch size to a good default value and enable the batch size option.
+ $this->setBatchSize( 200 );
+ }
+
+ public function execute() {
+ $batchSize = $this->getBatchSize();
+ $dbw = $this->getDB( DB_MASTER );
+ $lbFactory = \MediaWiki\MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
+ $dbr = $this->getDB( DB_REPLICA );
+ $from = wfTimestampOrNull( TS_MW, $this->getOption( 'from' ) );
+ $to = wfTimestampOrNull( TS_MW, $this->getOption( 'to' ) );
+
+ if ( $from === null || $to === null ) {
+ $this->output( "--from and --to have to be provided" . PHP_EOL );
+ return false;
+ }
+ if ( $from >= $to ) {
+ $this->output( "--from has to be smaller than --to" . PHP_EOL );
+ return false;
+ }
+ $batchStart = (int)$this->getOption( 'batch-start', 0 );
+ $changed = 0;
+ $dry = (bool)$this->getOption( 'dry' );
+
+ $message = "Resetting page_random column within date range from $from to $to";
+ if ( $batchStart > 0 ) {
+ $message .= " starting from page ID $batchStart";
+ }
+ $message .= $dry ? ". dry run" : '.';
+
+ $this->output( $message . PHP_EOL );
+ do {
+ $this->output( " ...doing chunk of $batchSize from $batchStart " . PHP_EOL );
+
+ // Find the oldest page revision associated with each page_id. Iff it falls in the given
+ // time range AND it's greater than $batchStart, yield the page ID. If it falls outside the
+ // time range, it was created before or after the occurrence of T208909 and its page_random
+ // is considered valid. The replica is used for this read since page_id and the rev_timestamp
+ // will not change between queries.
+ $res = $dbr->select(
+ 'page',
+ 'page_id',
+ [
+ '(' . $dbr->selectSQLText( 'revision', 'MIN(rev_timestamp)', 'rev_page=page_id' ) . ') ' .
+ 'BETWEEN ' . $dbr->addQuotes( $dbr->timestamp( $from ) ) .
+ ' AND ' . $dbr->addQuotes( $dbr->timestamp( $to ) ),
+ 'page_id > ' . $dbr->addQuotes( $batchStart )
+ ],
+ __METHOD__,
+ [ 'LIMIT' => $batchSize, 'ORDER BY' => 'page_id' ]
+ );
+
+ foreach ( $res as $row ) {
+ if ( !$dry ) {
+ # Update the row...
+ $dbw->update( 'page',
+ [ 'page_random' => wfRandom() ],
+ [ 'page_id' => $row->page_id ],
+ __METHOD__ );
+ $changed += $dbw->affectedRows();
+ } else {
+ $changed++;
+ }
+ }
+ if ( $row ) {
+ $batchStart = $row->page_id;
+ } else {
+ // We don't need to set the $batchStart as $res is empty,
+ // and we don't need to do another loop
+ // the while() condition will evaluate to false and
+ // we will leave the do{}while() block.
+ }
+
+ $lbFactory->waitForReplication();
+ } while ( $res->numRows() === $batchSize );
+ $this->output( "page_random reset complete ... changed $changed rows" . PHP_EOL );
+
+ return true;
+ }
+}
+
+$maintClass = ResetPageRandom::class;
+require_once RUN_MAINTENANCE_IF_MAIN;