maintenance/updateCollation.php

   1 <?php
   2 /**
   3  * Find all rows in the categorylinks table whose collation is out-of-date
   4  * (cl_collation != $wgCategoryCollation) and repopulate cl_sortkey
   5  * using the page title and cl_sortkey_prefix.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @ingroup Maintenance
  24  * @author Aryeh Gregor (Simetrical)
  25  */
  26
  27 require_once __DIR__ . '/Maintenance.php';
  28
  29 /**
  30  * Maintenance script that will find all rows in the categorylinks table
  31  * whose collation is out-of-date.
  32  *
  33  * @ingroup Maintenance
  34  */
  35 class UpdateCollation extends Maintenance {
  36         const BATCH_SIZE = 100; // Number of rows to process in one batch
  37         const SYNC_INTERVAL = 5; // Wait for replica DBs after this many batches
  38
  39         public $sizeHistogram = [];
  40
  41         public function __construct() {
  42                 parent::__construct();
  43
  44                 global $wgCategoryCollation;
  45                 $this->addDescription( <<<TEXT
  46 This script will find all rows in the categorylinks table whose collation is
  47 out-of-date (cl_collation != '$wgCategoryCollation') and repopulate cl_sortkey
  48 using the page title and cl_sortkey_prefix.  If all collations are
  49 up-to-date, it will do nothing.
  50 TEXT
  51                 );
  52
  53                 $this->addOption( 'force', 'Run on all rows, even if the collation is ' .
  54                         'supposed to be up-to-date.', false, false, 'f' );
  55                 $this->addOption( 'previous-collation', 'Set the previous value of ' .
  56                         '$wgCategoryCollation here to speed up this script, especially if your ' .
  57                         'categorylinks table is large. This will only update rows with that ' .
  58                         'collation, though, so it may miss out-of-date rows with a different, ' .
  59                         'even older collation.', false, true );
  60                 $this->addOption( 'target-collation', 'Set this to the new collation type to ' .
  61                         'use instead of $wgCategoryCollation. Usually you should not use this, ' .
  62                         'you should just update $wgCategoryCollation in LocalSettings.php.',
  63                         false, true );
  64                 $this->addOption( 'dry-run', 'Don\'t actually change the collations, just ' .
  65                         'compile statistics.' );
  66                 $this->addOption( 'verbose-stats', 'Show more statistics.' );
  67         }
  68
  69         public function execute() {
  70                 global $wgCategoryCollation;
  71
  72                 $dbw = $this->getDB( DB_MASTER );
  73                 $dbr = $this->getDB( DB_REPLICA );
  74                 $force = $this->getOption( 'force' );
  75                 $dryRun = $this->getOption( 'dry-run' );
  76                 $verboseStats = $this->getOption( 'verbose-stats' );
  77                 if ( $this->hasOption( 'target-collation' ) ) {
  78                         $collationName = $this->getOption( 'target-collation' );
  79                         $collation = Collation::factory( $collationName );
  80                 } else {
  81                         $collationName = $wgCategoryCollation;
  82                         $collation = Collation::singleton();
  83                 }
  84
  85                 // Collation sanity check: in some cases the constructor will work,
  86                 // but this will raise an exception, breaking all category pages
  87                 $collation->getFirstLetter( 'MediaWiki' );
  88
  89                 // Locally at least, (my local is a rather old version of mysql)
  90                 // mysql seems to filesort if there is both an equality
  91                 // (but not for an inequality) condition on cl_collation in the
  92                 // WHERE and it is also the first item in the ORDER BY.
  93                 if ( $this->hasOption( 'previous-collation' ) ) {
  94                         $orderBy = 'cl_to, cl_type, cl_from';
  95                 } else {
  96                         $orderBy = 'cl_collation, cl_to, cl_type, cl_from';
  97                 }
  98                 $options = [
  99                         'LIMIT' => self::BATCH_SIZE,
 100                         'ORDER BY' => $orderBy,
 101                         'STRAIGHT_JOIN' // per T58041
 102                 ];
 103
 104                 if ( $force ) {
 105                         $collationConds = [];
 106                 } else {
 107                         if ( $this->hasOption( 'previous-collation' ) ) {
 108                                 $collationConds['cl_collation'] = $this->getOption( 'previous-collation' );
 109                         } else {
 110                                 $collationConds = [ 0 =>
 111                                         'cl_collation != ' . $dbw->addQuotes( $collationName )
 112                                 ];
 113                         }
 114
 115                         $count = $dbr->estimateRowCount(
 116                                 'categorylinks',
 117                                 '*',
 118                                 $collationConds,
 119                                 __METHOD__
 120                         );
 121                         // Improve estimate if feasible
 122                         if ( $count < 1000000 ) {
 123                                 $count = $dbr->selectField(
 124                                         'categorylinks',
 125                                         'COUNT(*)',
 126                                         $collationConds,
 127                                         __METHOD__
 128                                 );
 129                         }
 130                         if ( $count == 0 ) {
 131                                 $this->output( "Collations up-to-date.\n" );
 132
 133                                 return;
 134                         }
 135                         if ( $dryRun ) {
 136                                 $this->output( "$count rows would be updated.\n" );
 137                         } else {
 138                                 $this->output( "Fixing collation for $count rows.\n" );
 139                         }
 140                         wfWaitForSlaves();
 141                 }
 142                 $count = 0;
 143                 $batchCount = 0;
 144                 $batchConds = [];
 145                 do {
 146                         $this->output( "Selecting next " . self::BATCH_SIZE . " rows..." );
 147
 148                         // cl_type must be selected as a number for proper paging because
 149                         // enums suck.
 150                         if ( $dbw->getType() === 'mysql' ) {
 151                                 $clType = 'cl_type+0 AS "cl_type_numeric"';
 152                         } else {
 153                                 $clType = 'cl_type';
 154                         }
 155                         $res = $dbw->select(
 156                                 [ 'categorylinks', 'page' ],
 157                                 [ 'cl_from', 'cl_to', 'cl_sortkey_prefix', 'cl_collation',
 158                                         'cl_sortkey', $clType,
 159                                         'page_namespace', 'page_title'
 160                                 ],
 161                                 array_merge( $collationConds, $batchConds, [ 'cl_from = page_id' ] ),
 162                                 __METHOD__,
 163                                 $options
 164                         );
 165                         $this->output( " processing..." );
 166
 167                         if ( !$dryRun ) {
 168                                 $this->beginTransaction( $dbw, __METHOD__ );
 169                         }
 170                         foreach ( $res as $row ) {
 171                                 $title = Title::newFromRow( $row );
 172                                 if ( !$row->cl_collation ) {
 173                                         # This is an old-style row, so the sortkey needs to be
 174                                         # converted.
 175                                         if ( $row->cl_sortkey == $title->getText()
 176                                                 || $row->cl_sortkey == $title->getPrefixedText()
 177                                         ) {
 178                                                 $prefix = '';
 179                                         } else {
 180                                                 # Custom sortkey, use it as a prefix
 181                                                 $prefix = $row->cl_sortkey;
 182                                         }
 183                                 } else {
 184                                         $prefix = $row->cl_sortkey_prefix;
 185                                 }
 186                                 # cl_type will be wrong for lots of pages if cl_collation is 0,
 187                                 # so let's update it while we're here.
 188                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 189                                         $type = 'subcat';
 190                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 191                                         $type = 'file';
 192                                 } else {
 193                                         $type = 'page';
 194                                 }
 195                                 $newSortKey = $collation->getSortKey(
 196                                         $title->getCategorySortkey( $prefix ) );
 197                                 if ( $verboseStats ) {
 198                                         $this->updateSortKeySizeHistogram( $newSortKey );
 199                                 }
 200
 201                                 if ( !$dryRun ) {
 202                                         $dbw->update(
 203                                                 'categorylinks',
 204                                                 [
 205                                                         'cl_sortkey' => $newSortKey,
 206                                                         'cl_sortkey_prefix' => $prefix,
 207                                                         'cl_collation' => $collationName,
 208                                                         'cl_type' => $type,
 209                                                         'cl_timestamp = cl_timestamp',
 210                                                 ],
 211                                                 [ 'cl_from' => $row->cl_from, 'cl_to' => $row->cl_to ],
 212                                                 __METHOD__
 213                                         );
 214                                 }
 215                                 if ( $row ) {
 216                                         $batchConds = [ $this->getBatchCondition( $row, $dbw ) ];
 217                                 }
 218                         }
 219                         if ( !$dryRun ) {
 220                                 $this->commitTransaction( $dbw, __METHOD__ );
 221                         }
 222
 223                         $count += $res->numRows();
 224                         $this->output( "$count done.\n" );
 225
 226                         if ( !$dryRun && ++$batchCount % self::SYNC_INTERVAL == 0 ) {
 227                                 $this->output( "Waiting for replica DBs ... " );
 228                                 wfWaitForSlaves();
 229                                 $this->output( "done\n" );
 230                         }
 231                 } while ( $res->numRows() == self::BATCH_SIZE );
 232
 233                 $this->output( "$count rows processed\n" );
 234
 235                 if ( $verboseStats ) {
 236                         $this->output( "\n" );
 237                         $this->showSortKeySizeHistogram();
 238                 }
 239         }
 240
 241         /**
 242          * Return an SQL expression selecting rows which sort above the given row,
 243          * assuming an ordering of cl_collation, cl_to, cl_type, cl_from
 244          * @param stdClass $row
 245          * @param Database $dbw
 246          * @return string
 247          */
 248         function getBatchCondition( $row, $dbw ) {
 249                 if ( $this->hasOption( 'previous-collation' ) ) {
 250                         $fields = [ 'cl_to', 'cl_type', 'cl_from' ];
 251                 } else {
 252                         $fields = [ 'cl_collation', 'cl_to', 'cl_type', 'cl_from' ];
 253                 }
 254                 $first = true;
 255                 $cond = false;
 256                 $prefix = false;
 257                 foreach ( $fields as $field ) {
 258                         if ( $dbw->getType() === 'mysql' && $field === 'cl_type' ) {
 259                                 // Range conditions with enums are weird in mysql
 260                                 // This must be a numeric literal, or it won't work.
 261                                 $encValue = intval( $row->cl_type_numeric );
 262                         } else {
 263                                 $encValue = $dbw->addQuotes( $row->$field );
 264                         }
 265                         $inequality = "$field > $encValue";
 266                         $equality = "$field = $encValue";
 267                         if ( $first ) {
 268                                 $cond = $inequality;
 269                                 $prefix = $equality;
 270                                 $first = false;
 271                         } else {
 272                                 $cond .= " OR ($prefix AND $inequality)";
 273                                 $prefix .= " AND $equality";
 274                         }
 275                 }
 276
 277                 return $cond;
 278         }
 279
 280         function updateSortKeySizeHistogram( $key ) {
 281                 $length = strlen( $key );
 282                 if ( !isset( $this->sizeHistogram[$length] ) ) {
 283                         $this->sizeHistogram[$length] = 0;
 284                 }
 285                 $this->sizeHistogram[$length]++;
 286         }
 287
 288         function showSortKeySizeHistogram() {
 289                 $maxLength = max( array_keys( $this->sizeHistogram ) );
 290                 if ( $maxLength == 0 ) {
 291                         return;
 292                 }
 293                 $numBins = 20;
 294                 $coarseHistogram = array_fill( 0, $numBins, 0 );
 295                 $coarseBoundaries = [];
 296                 $boundary = 0;
 297                 for ( $i = 0; $i < $numBins - 1; $i++ ) {
 298                         $boundary += $maxLength / $numBins;
 299                         $coarseBoundaries[$i] = round( $boundary );
 300                 }
 301                 $coarseBoundaries[$numBins - 1] = $maxLength + 1;
 302                 $raw = '';
 303                 for ( $i = 0; $i <= $maxLength; $i++ ) {
 304                         if ( $raw !== '' ) {
 305                                 $raw .= ', ';
 306                         }
 307                         if ( !isset( $this->sizeHistogram[$i] ) ) {
 308                                 $val = 0;
 309                         } else {
 310                                 $val = $this->sizeHistogram[$i];
 311                         }
 312                         for ( $coarseIndex = 0; $coarseIndex < $numBins - 1; $coarseIndex++ ) {
 313                                 if ( $coarseBoundaries[$coarseIndex] > $i ) {
 314                                         $coarseHistogram[$coarseIndex] += $val;
 315                                         break;
 316                                 }
 317                         }
 318                         if ( $coarseIndex == $numBins - 1 ) {
 319                                 $coarseHistogram[$coarseIndex] += $val;
 320                         }
 321                         $raw .= $val;
 322                 }
 323
 324                 $this->output( "Sort key size histogram\nRaw data: $raw\n\n" );
 325
 326                 $maxBinVal = max( $coarseHistogram );
 327                 $scale = 60 / $maxBinVal;
 328                 $prevBoundary = 0;
 329                 for ( $coarseIndex = 0; $coarseIndex < $numBins; $coarseIndex++ ) {
 330                         if ( !isset( $coarseHistogram[$coarseIndex] ) ) {
 331                                 $val = 0;
 332                         } else {
 333                                 $val = $coarseHistogram[$coarseIndex];
 334                         }
 335                         $boundary = $coarseBoundaries[$coarseIndex];
 336                         $this->output( sprintf( "%-10s %-10d |%s\n",
 337                                 $prevBoundary . '-' . ( $boundary - 1 ) . ': ',
 338                                 $val,
 339                                 str_repeat( '*', $scale * $val ) ) );
 340                         $prevBoundary = $boundary;
 341                 }
 342         }
 343 }
 344
 345 $maintClass = "UpdateCollation";
 346 require_once RUN_MAINTENANCE_IF_MAIN;