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| 1 | <?php |
| 2 | /** |
| 3 | * Moves blobs indexed by trackBlobs.php to a specified list of destination |
| 4 | * clusters, and recompresses them in the process. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | * http://www.gnu.org/copyleft/gpl.html |
| 20 | * |
| 21 | * @file |
| 22 | * @ingroup Maintenance ExternalStorage |
| 23 | */ |
| 24 | |
| 25 | use MediaWiki\Logger\LegacyLogger; |
| 26 | use MediaWiki\MediaWikiServices; |
| 27 | use MediaWiki\Shell\Shell; |
| 28 | use MediaWiki\Storage\SqlBlobStore; |
| 29 | use MediaWiki\Title\Title; |
| 30 | use MediaWiki\WikiMap\WikiMap; |
| 31 | use Wikimedia\AtEase\AtEase; |
| 32 | |
| 33 | $optionsWithArgs = RecompressTracked::getOptionsWithArgs(); |
| 34 | require __DIR__ . '/../CommandLineInc.php'; |
| 35 | |
| 36 | if ( count( $args ) < 1 ) { |
| 37 | echo "Usage: php recompressTracked.php [options] <cluster> [... <cluster>...] |
| 38 | Moves blobs indexed by trackBlobs.php to a specified list of destination clusters, |
| 39 | and recompresses them in the process. Restartable. |
| 40 | |
| 41 | Options: |
| 42 | --procs <procs> Set the number of child processes (default 1) |
| 43 | --copy-only Copy only, do not update the text table. Restart |
| 44 | without this option to complete. |
| 45 | --debug-log <file> Log debugging data to the specified file |
| 46 | --info-log <file> Log progress messages to the specified file |
| 47 | --critical-log <file> Log error messages to the specified file |
| 48 | "; |
| 49 | exit( 1 ); |
| 50 | } |
| 51 | |
| 52 | $job = RecompressTracked::newFromCommandLine( $args, $options ); |
| 53 | $job->execute(); |
| 54 | |
| 55 | /** |
| 56 | * Maintenance script that moves blobs indexed by trackBlobs.php to a specified |
| 57 | * list of destination clusters, and recompresses them in the process. |
| 58 | * |
| 59 | * @ingroup Maintenance ExternalStorage |
| 60 | */ |
| 61 | class RecompressTracked { |
| 62 | /** @var string[] */ |
| 63 | public $destClusters; |
| 64 | /** @var int */ |
| 65 | public $batchSize = 1000; |
| 66 | /** @var int */ |
| 67 | public $orphanBatchSize = 1000; |
| 68 | /** @var int */ |
| 69 | public $reportingInterval = 10; |
| 70 | /** @var int */ |
| 71 | public $numProcs = 1; |
| 72 | /** @var int */ |
| 73 | public $numBatches = 0; |
| 74 | /** @var string */ |
| 75 | public $pageBlobClass; |
| 76 | /** @var string */ |
| 77 | public $orphanBlobClass; |
| 78 | /** @var resource[] */ |
| 79 | public $childPipes; |
| 80 | /** @var resource[] */ |
| 81 | public $childProcs; |
| 82 | /** @var int */ |
| 83 | public $prevChildId; |
| 84 | /** @var bool */ |
| 85 | public $copyOnly = false; |
| 86 | /** @var bool */ |
| 87 | public $isChild = false; |
| 88 | /** @var int|false */ |
| 89 | public $childId = false; |
| 90 | /** @var bool */ |
| 91 | public $noCount = false; |
| 92 | public ?string $debugLog = null; |
| 93 | public ?string $infoLog = null; |
| 94 | public ?string $criticalLog = null; |
| 95 | /** @var ExternalStoreDB */ |
| 96 | public $store; |
| 97 | /** @var SqlBlobStore */ |
| 98 | private $blobStore; |
| 99 | |
| 100 | /** @var string[] */ |
| 101 | private static $optionsWithArgs = [ |
| 102 | 'procs', |
| 103 | 'child-id', |
| 104 | 'debug-log', |
| 105 | 'info-log', |
| 106 | 'critical-log' |
| 107 | ]; |
| 108 | |
| 109 | /** @var string[] */ |
| 110 | private static $cmdLineOptionMap = [ |
| 111 | 'no-count' => 'noCount', |
| 112 | 'procs' => 'numProcs', |
| 113 | 'copy-only' => 'copyOnly', |
| 114 | 'child' => 'isChild', |
| 115 | 'child-id' => 'childId', |
| 116 | 'debug-log' => 'debugLog', |
| 117 | 'info-log' => 'infoLog', |
| 118 | 'critical-log' => 'criticalLog', |
| 119 | ]; |
| 120 | |
| 121 | public static function getOptionsWithArgs() { |
| 122 | return self::$optionsWithArgs; |
| 123 | } |
| 124 | |
| 125 | public static function newFromCommandLine( $args, $options ) { |
| 126 | $jobOptions = [ 'destClusters' => $args ]; |
| 127 | foreach ( self::$cmdLineOptionMap as $cmdOption => $classOption ) { |
| 128 | if ( isset( $options[$cmdOption] ) ) { |
| 129 | $jobOptions[$classOption] = $options[$cmdOption]; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | return new self( $jobOptions ); |
| 134 | } |
| 135 | |
| 136 | public function __construct( $options ) { |
| 137 | foreach ( $options as $name => $value ) { |
| 138 | $this->$name = $value; |
| 139 | } |
| 140 | $esFactory = MediaWikiServices::getInstance()->getExternalStoreFactory(); |
| 141 | $this->store = $esFactory->getStore( 'DB' ); |
| 142 | if ( !$this->isChild ) { |
| 143 | $GLOBALS['wgDebugLogPrefix'] = "RCT M: "; |
| 144 | } elseif ( $this->childId !== false ) { |
| 145 | $GLOBALS['wgDebugLogPrefix'] = "RCT {$this->childId}: "; |
| 146 | } |
| 147 | $this->pageBlobClass = function_exists( 'xdiff_string_bdiff' ) ? |
| 148 | DiffHistoryBlob::class : ConcatenatedGzipHistoryBlob::class; |
| 149 | $this->orphanBlobClass = ConcatenatedGzipHistoryBlob::class; |
| 150 | |
| 151 | $this->blobStore = MediaWikiServices::getInstance() |
| 152 | ->getBlobStoreFactory() |
| 153 | ->newSqlBlobStore(); |
| 154 | } |
| 155 | |
| 156 | public function debug( $msg ) { |
| 157 | wfDebug( "$msg" ); |
| 158 | if ( $this->debugLog ) { |
| 159 | $this->logToFile( $msg, $this->debugLog ); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | public function info( $msg ) { |
| 164 | echo "$msg\n"; |
| 165 | if ( $this->infoLog ) { |
| 166 | $this->logToFile( $msg, $this->infoLog ); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | public function critical( $msg ) { |
| 171 | echo "$msg\n"; |
| 172 | if ( $this->criticalLog ) { |
| 173 | $this->logToFile( $msg, $this->criticalLog ); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | private function logToFile( $msg, $file ) { |
| 178 | $header = '[' . date( 'd\TH:i:s' ) . '] ' . wfHostname() . ' ' . posix_getpid(); |
| 179 | if ( $this->childId !== false ) { |
| 180 | $header .= "({$this->childId})"; |
| 181 | } |
| 182 | $header .= ' ' . WikiMap::getCurrentWikiDbDomain()->getId(); |
| 183 | LegacyLogger::emit( sprintf( "%-50s %s\n", $header, $msg ), $file ); |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Wait until the selected replica DB has caught up to the master. |
| 188 | * This allows us to use the replica DB for things that were committed in a |
| 189 | * previous part of this batch process. |
| 190 | */ |
| 191 | private function syncDBs() { |
| 192 | MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication( [ 'timeout' => 100_000 ] ); |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Execute parent or child depending on the isChild option |
| 197 | */ |
| 198 | public function execute() { |
| 199 | if ( $this->isChild ) { |
| 200 | $this->executeChild(); |
| 201 | } else { |
| 202 | $this->executeParent(); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Execute the parent process |
| 208 | */ |
| 209 | public function executeParent() { |
| 210 | if ( !$this->checkTrackingTable() ) { |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | $this->syncDBs(); |
| 215 | $this->startChildProcs(); |
| 216 | $this->doAllPages(); |
| 217 | $this->doAllOrphans(); |
| 218 | $this->killChildProcs(); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Make sure the tracking table exists and isn't empty |
| 223 | * @return bool |
| 224 | */ |
| 225 | private function checkTrackingTable() { |
| 226 | $row = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase()->newSelectQueryBuilder() |
| 227 | ->select( '*' ) |
| 228 | ->from( 'blob_tracking' ) |
| 229 | ->caller( __METHOD__ )->fetchRow(); |
| 230 | if ( !$row ) { |
| 231 | $this->info( "Warning: blob_tracking table contains no rows, skipping this wiki." ); |
| 232 | |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | return true; |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * Start the worker processes. |
| 241 | * These processes will listen on stdin for commands. |
| 242 | * This necessary because text recompression is slow: loading, compressing and |
| 243 | * writing are all slow. |
| 244 | */ |
| 245 | private function startChildProcs() { |
| 246 | $wiki = WikiMap::getCurrentWikiId(); |
| 247 | |
| 248 | $cmd = 'php ' . Shell::escape( __FILE__ ); |
| 249 | foreach ( self::$cmdLineOptionMap as $cmdOption => $classOption ) { |
| 250 | if ( $cmdOption == 'child-id' ) { |
| 251 | continue; |
| 252 | } |
| 253 | // @phan-suppress-next-line MediaWikiNoIssetIfDefined |
| 254 | if ( in_array( $cmdOption, self::$optionsWithArgs ) && isset( $this->$classOption ) ) { |
| 255 | // @phan-suppress-next-line PhanTypeMismatchArgument False positive |
| 256 | $cmd .= " --$cmdOption " . Shell::escape( $this->$classOption ); |
| 257 | } elseif ( $this->$classOption ) { |
| 258 | $cmd .= " --$cmdOption"; |
| 259 | } |
| 260 | } |
| 261 | $cmd .= ' --child' . |
| 262 | ' --wiki ' . Shell::escape( $wiki ) . |
| 263 | ' ' . Shell::escape( ...$this->destClusters ); |
| 264 | |
| 265 | $this->childPipes = $this->childProcs = []; |
| 266 | for ( $i = 0; $i < $this->numProcs; $i++ ) { |
| 267 | $pipes = []; |
| 268 | $spec = [ |
| 269 | [ 'pipe', 'r' ], |
| 270 | [ 'file', 'php://stdout', 'w' ], |
| 271 | [ 'file', 'php://stderr', 'w' ] |
| 272 | ]; |
| 273 | AtEase::suppressWarnings(); |
| 274 | $proc = proc_open( "$cmd --child-id $i", $spec, $pipes ); |
| 275 | AtEase::restoreWarnings(); |
| 276 | if ( !$proc ) { |
| 277 | $this->critical( "Error opening child process: $cmd" ); |
| 278 | exit( 1 ); |
| 279 | } |
| 280 | $this->childProcs[$i] = $proc; |
| 281 | $this->childPipes[$i] = $pipes[0]; |
| 282 | } |
| 283 | $this->prevChildId = -1; |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * Gracefully terminate the child processes |
| 288 | */ |
| 289 | private function killChildProcs() { |
| 290 | $this->info( "Waiting for child processes to finish..." ); |
| 291 | for ( $i = 0; $i < $this->numProcs; $i++ ) { |
| 292 | $this->dispatchToChild( $i, 'quit' ); |
| 293 | } |
| 294 | for ( $i = 0; $i < $this->numProcs; $i++ ) { |
| 295 | $status = proc_close( $this->childProcs[$i] ); |
| 296 | if ( $status ) { |
| 297 | $this->critical( "Warning: child #$i exited with status $status" ); |
| 298 | } |
| 299 | } |
| 300 | $this->info( "Done." ); |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Dispatch a command to the next available child process. |
| 305 | * This may block until a child process finishes its work and becomes available. |
| 306 | * @param array|string ...$args |
| 307 | */ |
| 308 | private function dispatch( ...$args ) { |
| 309 | $pipes = $this->childPipes; |
| 310 | $x = []; |
| 311 | $y = []; |
| 312 | $numPipes = stream_select( $x, $pipes, $y, 3600 ); |
| 313 | if ( !$numPipes ) { |
| 314 | $this->critical( "Error waiting to write to child process. Aborting" ); |
| 315 | exit( 1 ); |
| 316 | } |
| 317 | for ( $i = 0; $i < $this->numProcs; $i++ ) { |
| 318 | $childId = ( $i + $this->prevChildId + 1 ) % $this->numProcs; |
| 319 | if ( isset( $pipes[$childId] ) ) { |
| 320 | $this->prevChildId = $childId; |
| 321 | $this->dispatchToChild( $childId, $args ); |
| 322 | |
| 323 | return; |
| 324 | } |
| 325 | } |
| 326 | $this->critical( "Unreachable" ); |
| 327 | exit( 1 ); |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * Dispatch a command to a specified child process |
| 332 | * @param int $childId |
| 333 | * @param array|string $args |
| 334 | */ |
| 335 | private function dispatchToChild( $childId, $args ) { |
| 336 | $args = (array)$args; |
| 337 | $cmd = implode( ' ', $args ); |
| 338 | fwrite( $this->childPipes[$childId], "$cmd\n" ); |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * Move all tracked pages to the new clusters |
| 343 | */ |
| 344 | private function doAllPages() { |
| 345 | $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); |
| 346 | $i = 0; |
| 347 | $startId = 0; |
| 348 | if ( $this->noCount ) { |
| 349 | $numPages = '[unknown]'; |
| 350 | } else { |
| 351 | $numPages = $dbr->newSelectQueryBuilder() |
| 352 | ->select( 'COUNT(DISTINCT bt_page)' ) |
| 353 | ->from( 'blob_tracking' ) |
| 354 | ->where( [ 'bt_moved' => 0 ] ) |
| 355 | ->caller( __METHOD__ )->fetchField(); |
| 356 | } |
| 357 | if ( $this->copyOnly ) { |
| 358 | $this->info( "Copying pages..." ); |
| 359 | } else { |
| 360 | $this->info( "Moving pages..." ); |
| 361 | } |
| 362 | while ( true ) { |
| 363 | $res = $dbr->newSelectQueryBuilder() |
| 364 | ->select( [ 'bt_page' ] ) |
| 365 | ->distinct() |
| 366 | ->from( 'blob_tracking' ) |
| 367 | ->where( [ 'bt_moved' => 0, $dbr->expr( 'bt_page', '>', $startId ) ] ) |
| 368 | ->orderBy( 'bt_page' ) |
| 369 | ->limit( $this->batchSize ) |
| 370 | ->caller( __METHOD__ )->fetchResultSet(); |
| 371 | if ( !$res->numRows() ) { |
| 372 | break; |
| 373 | } |
| 374 | foreach ( $res as $row ) { |
| 375 | $startId = $row->bt_page; |
| 376 | $this->dispatch( 'doPage', $row->bt_page ); |
| 377 | $i++; |
| 378 | } |
| 379 | $this->report( 'pages', $i, $numPages ); |
| 380 | } |
| 381 | $this->report( 'pages', $i, $numPages ); |
| 382 | if ( $this->copyOnly ) { |
| 383 | $this->info( "All page copies queued." ); |
| 384 | } else { |
| 385 | $this->info( "All page moves queued." ); |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * Display a progress report |
| 391 | * @param string $label |
| 392 | * @param int $current |
| 393 | * @param int $end |
| 394 | */ |
| 395 | private function report( $label, $current, $end ) { |
| 396 | $this->numBatches++; |
| 397 | if ( $current == $end || $this->numBatches >= $this->reportingInterval ) { |
| 398 | $this->numBatches = 0; |
| 399 | $this->info( "$label: $current / $end" ); |
| 400 | MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication(); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | /** |
| 405 | * Move all orphan text to the new clusters |
| 406 | */ |
| 407 | private function doAllOrphans() { |
| 408 | $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); |
| 409 | $startId = 0; |
| 410 | $i = 0; |
| 411 | if ( $this->noCount ) { |
| 412 | $numOrphans = '[unknown]'; |
| 413 | } else { |
| 414 | $numOrphans = $dbr->newSelectQueryBuilder() |
| 415 | ->select( 'COUNT(DISTINCT bt_text_id)' ) |
| 416 | ->from( 'blob_tracking' ) |
| 417 | ->where( [ 'bt_moved' => 0, 'bt_page' => 0 ] ) |
| 418 | ->caller( __METHOD__ )->fetchField(); |
| 419 | if ( !$numOrphans ) { |
| 420 | return; |
| 421 | } |
| 422 | } |
| 423 | if ( $this->copyOnly ) { |
| 424 | $this->info( "Copying orphans..." ); |
| 425 | } else { |
| 426 | $this->info( "Moving orphans..." ); |
| 427 | } |
| 428 | |
| 429 | while ( true ) { |
| 430 | $res = $dbr->newSelectQueryBuilder() |
| 431 | ->select( [ 'bt_text_id' ] ) |
| 432 | ->distinct() |
| 433 | ->from( 'blob_tracking' ) |
| 434 | ->where( [ 'bt_moved' => 0, 'bt_page' => 0, $dbr->expr( 'bt_text_id', '>', $startId ) ] ) |
| 435 | ->orderBy( 'bt_text_id' ) |
| 436 | ->limit( $this->batchSize ) |
| 437 | ->caller( __METHOD__ )->fetchResultSet(); |
| 438 | if ( !$res->numRows() ) { |
| 439 | break; |
| 440 | } |
| 441 | $ids = []; |
| 442 | foreach ( $res as $row ) { |
| 443 | $startId = $row->bt_text_id; |
| 444 | $ids[] = $row->bt_text_id; |
| 445 | $i++; |
| 446 | } |
| 447 | // Need to send enough orphan IDs to the child at a time to fill a blob, |
| 448 | // so orphanBatchSize needs to be at least ~100. |
| 449 | // batchSize can be smaller or larger. |
| 450 | while ( count( $ids ) > $this->orphanBatchSize ) { |
| 451 | $args = array_slice( $ids, 0, $this->orphanBatchSize ); |
| 452 | $ids = array_slice( $ids, $this->orphanBatchSize ); |
| 453 | array_unshift( $args, 'doOrphanList' ); |
| 454 | $this->dispatch( ...$args ); |
| 455 | } |
| 456 | if ( count( $ids ) ) { |
| 457 | $args = $ids; |
| 458 | array_unshift( $args, 'doOrphanList' ); |
| 459 | $this->dispatch( ...$args ); |
| 460 | } |
| 461 | |
| 462 | $this->report( 'orphans', $i, $numOrphans ); |
| 463 | } |
| 464 | $this->report( 'orphans', $i, $numOrphans ); |
| 465 | $this->info( "All orphans queued." ); |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * Main entry point for worker processes |
| 470 | */ |
| 471 | public function executeChild() { |
| 472 | $this->debug( 'starting' ); |
| 473 | $this->syncDBs(); |
| 474 | |
| 475 | while ( !feof( STDIN ) ) { |
| 476 | $line = rtrim( fgets( STDIN ) ); |
| 477 | if ( $line == '' ) { |
| 478 | continue; |
| 479 | } |
| 480 | $this->debug( $line ); |
| 481 | $args = explode( ' ', $line ); |
| 482 | $cmd = array_shift( $args ); |
| 483 | switch ( $cmd ) { |
| 484 | case 'doPage': |
| 485 | $this->doPage( intval( $args[0] ) ); |
| 486 | break; |
| 487 | case 'doOrphanList': |
| 488 | $this->doOrphanList( array_map( 'intval', $args ) ); |
| 489 | break; |
| 490 | case 'quit': |
| 491 | return; |
| 492 | } |
| 493 | MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication(); |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * Move tracked text in a given page |
| 499 | * |
| 500 | * @param int $pageId |
| 501 | */ |
| 502 | private function doPage( $pageId ) { |
| 503 | $title = Title::newFromID( $pageId ); |
| 504 | if ( $title ) { |
| 505 | $titleText = $title->getPrefixedText(); |
| 506 | } else { |
| 507 | $titleText = '[deleted]'; |
| 508 | } |
| 509 | $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); |
| 510 | |
| 511 | // Finish any incomplete transactions |
| 512 | if ( !$this->copyOnly ) { |
| 513 | $this->finishIncompleteMoves( [ 'bt_page' => $pageId ] ); |
| 514 | $this->syncDBs(); |
| 515 | } |
| 516 | |
| 517 | $startId = 0; |
| 518 | $trx = new CgzCopyTransaction( $this, $this->pageBlobClass ); |
| 519 | |
| 520 | $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory(); |
| 521 | while ( true ) { |
| 522 | $res = $dbr->newSelectQueryBuilder() |
| 523 | ->select( '*' ) |
| 524 | ->from( 'blob_tracking' ) |
| 525 | ->join( 'text', null, 'bt_text_id=old_id' ) |
| 526 | ->where( [ |
| 527 | 'bt_page' => $pageId, |
| 528 | $dbr->expr( 'bt_text_id', '>', $startId ), |
| 529 | 'bt_moved' => 0, |
| 530 | 'bt_new_url' => null, |
| 531 | ] ) |
| 532 | ->orderBy( 'bt_text_id' ) |
| 533 | ->limit( $this->batchSize ) |
| 534 | ->caller( __METHOD__ )->fetchResultSet(); |
| 535 | if ( !$res->numRows() ) { |
| 536 | break; |
| 537 | } |
| 538 | |
| 539 | $lastTextId = 0; |
| 540 | foreach ( $res as $row ) { |
| 541 | $startId = $row->bt_text_id; |
| 542 | if ( $lastTextId == $row->bt_text_id ) { |
| 543 | // Duplicate (null edit) |
| 544 | continue; |
| 545 | } |
| 546 | $lastTextId = $row->bt_text_id; |
| 547 | // Load the text |
| 548 | $text = $this->blobStore->expandBlob( $row->old_text, $row->old_flags ); |
| 549 | if ( $text === false ) { |
| 550 | $this->critical( "Error loading {$row->bt_rev_id}/{$row->bt_text_id}" ); |
| 551 | continue; |
| 552 | } |
| 553 | |
| 554 | // Queue it |
| 555 | if ( !$trx->addItem( $text, $row->bt_text_id ) ) { |
| 556 | $this->debug( "$titleText: committing blob with " . $trx->getSize() . " items" ); |
| 557 | $trx->commit(); |
| 558 | $trx = new CgzCopyTransaction( $this, $this->pageBlobClass ); |
| 559 | $lbFactory->waitForReplication(); |
| 560 | } |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | $this->debug( "$titleText: committing blob with " . $trx->getSize() . " items" ); |
| 565 | $trx->commit(); |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * Atomic move operation. |
| 570 | * |
| 571 | * Write the new URL to the text table and set the bt_moved flag. |
| 572 | * |
| 573 | * This is done in a single transaction to provide restartable behavior |
| 574 | * without data loss. |
| 575 | * |
| 576 | * The transaction is kept short to reduce locking. |
| 577 | * |
| 578 | * @param int $textId |
| 579 | * @param string $url |
| 580 | */ |
| 581 | public function moveTextRow( $textId, $url ) { |
| 582 | if ( $this->copyOnly ) { |
| 583 | $this->critical( "Internal error: can't call moveTextRow() in --copy-only mode" ); |
| 584 | exit( 1 ); |
| 585 | } |
| 586 | $dbw = MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase(); |
| 587 | |
| 588 | $dbw->begin( __METHOD__ ); |
| 589 | $dbw->newUpdateQueryBuilder() |
| 590 | ->update( 'text' ) |
| 591 | ->set( [ |
| 592 | 'old_text' => $url, |
| 593 | 'old_flags' => 'external,utf-8', |
| 594 | ] ) |
| 595 | ->where( [ |
| 596 | 'old_id' => $textId |
| 597 | ] ) |
| 598 | ->caller( __METHOD__ ) |
| 599 | ->execute(); |
| 600 | $dbw->newUpdateQueryBuilder() |
| 601 | ->update( 'blob_tracking' ) |
| 602 | ->set( [ 'bt_moved' => 1 ] ) |
| 603 | ->where( [ 'bt_text_id' => $textId ] ) |
| 604 | ->caller( __METHOD__ ) |
| 605 | ->execute(); |
| 606 | $dbw->commit( __METHOD__ ); |
| 607 | } |
| 608 | |
| 609 | /** |
| 610 | * Moves are done in two phases: bt_new_url and then bt_moved. |
| 611 | * - bt_new_url indicates that the text has been copied to the new cluster. |
| 612 | * - bt_moved indicates that the text table has been updated. |
| 613 | * |
| 614 | * This function completes any moves that only have done bt_new_url. This |
| 615 | * can happen when the script is interrupted, or when --copy-only is used. |
| 616 | * |
| 617 | * @param array $conds |
| 618 | */ |
| 619 | private function finishIncompleteMoves( $conds ) { |
| 620 | $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); |
| 621 | $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory(); |
| 622 | |
| 623 | $startId = 0; |
| 624 | $conds = array_merge( $conds, [ |
| 625 | 'bt_moved' => 0, |
| 626 | $dbr->expr( 'bt_new_url', '!=', null ), |
| 627 | ] ); |
| 628 | while ( true ) { |
| 629 | $res = $dbr->newSelectQueryBuilder() |
| 630 | ->select( '*' ) |
| 631 | ->from( 'blob_tracking' ) |
| 632 | ->where( $conds ) |
| 633 | ->andWhere( $dbr->expr( 'bt_text_id', '>', $startId ) ) |
| 634 | ->orderBy( 'bt_text_id' ) |
| 635 | ->limit( $this->batchSize ) |
| 636 | ->caller( __METHOD__ )->fetchResultSet(); |
| 637 | if ( !$res->numRows() ) { |
| 638 | break; |
| 639 | } |
| 640 | $this->debug( 'Incomplete: ' . $res->numRows() . ' rows' ); |
| 641 | foreach ( $res as $row ) { |
| 642 | $startId = $row->bt_text_id; |
| 643 | $this->moveTextRow( $row->bt_text_id, $row->bt_new_url ); |
| 644 | if ( $row->bt_text_id % 10 == 0 ) { |
| 645 | $lbFactory->waitForReplication(); |
| 646 | } |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * Returns the name of the next target cluster |
| 653 | * @return string |
| 654 | */ |
| 655 | public function getTargetCluster() { |
| 656 | $cluster = next( $this->destClusters ); |
| 657 | if ( $cluster === false ) { |
| 658 | $cluster = reset( $this->destClusters ); |
| 659 | } |
| 660 | |
| 661 | return $cluster; |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * Move an orphan text_id to the new cluster |
| 666 | * |
| 667 | * @param array $textIds |
| 668 | */ |
| 669 | private function doOrphanList( $textIds ) { |
| 670 | // Finish incomplete moves |
| 671 | if ( !$this->copyOnly ) { |
| 672 | $this->finishIncompleteMoves( [ 'bt_text_id' => $textIds ] ); |
| 673 | $this->syncDBs(); |
| 674 | } |
| 675 | |
| 676 | $trx = new CgzCopyTransaction( $this, $this->orphanBlobClass ); |
| 677 | |
| 678 | $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory(); |
| 679 | $res = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase()->newSelectQueryBuilder() |
| 680 | ->select( [ 'old_id', 'old_text', 'old_flags' ] ) |
| 681 | ->distinct() |
| 682 | ->from( 'text' ) |
| 683 | ->join( 'blob_tracking', null, 'bt_text_id=old_id' ) |
| 684 | ->where( [ 'old_id' => $textIds, 'bt_moved' => 0 ] ) |
| 685 | ->caller( __METHOD__ )->fetchResultSet(); |
| 686 | |
| 687 | foreach ( $res as $row ) { |
| 688 | $text = $this->blobStore->expandBlob( $row->old_text, $row->old_flags ); |
| 689 | if ( $text === false ) { |
| 690 | $this->critical( "Error: cannot load revision text for old_id={$row->old_id}" ); |
| 691 | continue; |
| 692 | } |
| 693 | |
| 694 | if ( !$trx->addItem( $text, $row->old_id ) ) { |
| 695 | $this->debug( "[orphan]: committing blob with " . $trx->getSize() . " rows" ); |
| 696 | $trx->commit(); |
| 697 | $trx = new CgzCopyTransaction( $this, $this->orphanBlobClass ); |
| 698 | $lbFactory->waitForReplication(); |
| 699 | } |
| 700 | } |
| 701 | $this->debug( "[orphan]: committing blob with " . $trx->getSize() . " rows" ); |
| 702 | $trx->commit(); |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * Class to represent a recompression operation for a single CGZ blob |
| 708 | */ |
| 709 | class CgzCopyTransaction { |
| 710 | /** @var RecompressTracked */ |
| 711 | public $parent; |
| 712 | /** @var string */ |
| 713 | public $blobClass; |
| 714 | /** @var ConcatenatedGzipHistoryBlob|false */ |
| 715 | public $cgz; |
| 716 | /** @var string[] */ |
| 717 | public $referrers; |
| 718 | /** @var array */ |
| 719 | private $texts; |
| 720 | |
| 721 | /** |
| 722 | * Create a transaction from a RecompressTracked object |
| 723 | * @param RecompressTracked $parent |
| 724 | * @param string $blobClass |
| 725 | */ |
| 726 | public function __construct( $parent, $blobClass ) { |
| 727 | $this->blobClass = $blobClass; |
| 728 | $this->cgz = false; |
| 729 | $this->texts = []; |
| 730 | $this->parent = $parent; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Add text. |
| 735 | * Returns false if it's ready to commit. |
| 736 | * @param string $text |
| 737 | * @param int $textId |
| 738 | * @return bool |
| 739 | */ |
| 740 | public function addItem( $text, $textId ) { |
| 741 | if ( !$this->cgz ) { |
| 742 | $class = $this->blobClass; |
| 743 | $this->cgz = new $class; |
| 744 | } |
| 745 | $hash = $this->cgz->addItem( $text ); |
| 746 | $this->referrers[$textId] = $hash; |
| 747 | $this->texts[$textId] = $text; |
| 748 | |
| 749 | return $this->cgz->isHappy(); |
| 750 | } |
| 751 | |
| 752 | public function getSize() { |
| 753 | return count( $this->texts ); |
| 754 | } |
| 755 | |
| 756 | /** |
| 757 | * Recompress text after some aberrant modification |
| 758 | */ |
| 759 | public function recompress() { |
| 760 | $class = $this->blobClass; |
| 761 | $this->cgz = new $class; |
| 762 | $this->referrers = []; |
| 763 | foreach ( $this->texts as $textId => $text ) { |
| 764 | $hash = $this->cgz->addItem( $text ); |
| 765 | $this->referrers[$textId] = $hash; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | /** |
| 770 | * Commit the blob. |
| 771 | * Does nothing if no text items have been added. |
| 772 | * May skip the move if --copy-only is set. |
| 773 | */ |
| 774 | public function commit() { |
| 775 | $originalCount = count( $this->texts ); |
| 776 | if ( !$originalCount ) { |
| 777 | return; |
| 778 | } |
| 779 | |
| 780 | /* Check to see if the target text_ids have been moved already. |
| 781 | * |
| 782 | * We originally read from the replica DB, so this can happen when a single |
| 783 | * text_id is shared between multiple pages. It's rare, but possible |
| 784 | * if a delete/move/undelete cycle splits up a null edit. |
| 785 | * |
| 786 | * We do a locking read to prevent closer-run race conditions. |
| 787 | */ |
| 788 | $dbw = MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase(); |
| 789 | $dbw->begin( __METHOD__ ); |
| 790 | $res = $dbw->newSelectQueryBuilder() |
| 791 | ->select( [ 'bt_text_id', 'bt_moved' ] ) |
| 792 | ->forUpdate() |
| 793 | ->from( 'blob_tracking' ) |
| 794 | ->where( [ 'bt_text_id' => array_keys( $this->referrers ) ] ) |
| 795 | ->caller( __METHOD__ )->fetchResultSet(); |
| 796 | $dirty = false; |
| 797 | foreach ( $res as $row ) { |
| 798 | if ( $row->bt_moved ) { |
| 799 | # This row has already been moved, remove it |
| 800 | $this->parent->debug( "TRX: conflict detected in old_id={$row->bt_text_id}" ); |
| 801 | unset( $this->texts[$row->bt_text_id] ); |
| 802 | $dirty = true; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | // Recompress the blob if necessary |
| 807 | if ( $dirty ) { |
| 808 | if ( !count( $this->texts ) ) { |
| 809 | // All have been moved already |
| 810 | if ( $originalCount > 1 ) { |
| 811 | // This is suspcious, make noise |
| 812 | $this->parent->critical( |
| 813 | "Warning: concurrent operation detected, are there two conflicting " . |
| 814 | "processes running, doing the same job?" ); |
| 815 | } |
| 816 | |
| 817 | return; |
| 818 | } |
| 819 | $this->recompress(); |
| 820 | } |
| 821 | |
| 822 | // Insert the data into the destination cluster |
| 823 | $targetCluster = $this->parent->getTargetCluster(); |
| 824 | $store = $this->parent->store; |
| 825 | $targetDB = $store->getPrimary( $targetCluster ); |
| 826 | $targetDB->begin( __METHOD__ ); |
| 827 | $baseUrl = $this->parent->store->store( $targetCluster, serialize( $this->cgz ) ); |
| 828 | |
| 829 | // Write the new URLs to the blob_tracking table |
| 830 | foreach ( $this->referrers as $textId => $hash ) { |
| 831 | $url = $baseUrl . '/' . $hash; |
| 832 | $dbw->newUpdateQueryBuilder() |
| 833 | ->update( 'blob_tracking' ) |
| 834 | ->set( [ 'bt_new_url' => $url ] ) |
| 835 | ->where( [ |
| 836 | 'bt_text_id' => $textId, |
| 837 | 'bt_moved' => 0, # Check for concurrent conflicting update |
| 838 | ] ) |
| 839 | ->caller( __METHOD__ ) |
| 840 | ->execute(); |
| 841 | } |
| 842 | |
| 843 | $targetDB->commit( __METHOD__ ); |
| 844 | // Critical section here: interruption at this point causes blob duplication |
| 845 | // Reversing the order of the commits would cause data loss instead |
| 846 | $dbw->commit( __METHOD__ ); |
| 847 | |
| 848 | // Write the new URLs to the text table and set the moved flag |
| 849 | if ( !$this->parent->copyOnly ) { |
| 850 | foreach ( $this->referrers as $textId => $hash ) { |
| 851 | $url = $baseUrl . '/' . $hash; |
| 852 | $this->parent->moveTextRow( $textId, $url ); |
| 853 | } |
| 854 | } |
| 855 | } |
| 856 | } |