MediaWiki master
recompressTracked.php
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1<?php
31use Wikimedia\AtEase\AtEase;
32
34require __DIR__ . '/../CommandLineInc.php';
35
36if ( count( $args ) < 1 ) {
37 echo "Usage: php recompressTracked.php [options] <cluster> [... <cluster>...]
38Moves blobs indexed by trackBlobs.php to a specified list of destination clusters,
39and recompresses them in the process. Restartable.
40
41Options:
42 --procs <procs> Set the number of child processes (default 1)
43 --copy-only Copy only, do not update the text table. Restart
44 without this option to complete.
45 --debug-log <file> Log debugging data to the specified file
46 --info-log <file> Log progress messages to the specified file
47 --critical-log <file> Log error messages to the specified file
48";
49 exit( 1 );
50}
51
53$job->execute();
54
63 public $batchSize = 1000;
64 public $orphanBatchSize = 1000;
65 public $reportingInterval = 10;
66 public $numProcs = 1;
67 public $numBatches = 0;
73 public $copyOnly = false;
74 public $isChild = false;
75 public $childId = false;
76 public $noCount = false;
77 public ?string $debugLog = null;
78 public ?string $infoLog = null;
79 public ?string $criticalLog = null;
81 public $store;
83 private $blobStore;
84
85 private static $optionsWithArgs = [
86 'procs',
87 'child-id',
88 'debug-log',
89 'info-log',
90 'critical-log'
91 ];
92
93 private static $cmdLineOptionMap = [
94 'no-count' => 'noCount',
95 'procs' => 'numProcs',
96 'copy-only' => 'copyOnly',
97 'child' => 'isChild',
98 'child-id' => 'childId',
99 'debug-log' => 'debugLog',
100 'info-log' => 'infoLog',
101 'critical-log' => 'criticalLog',
102 ];
103
104 public static function getOptionsWithArgs() {
105 return self::$optionsWithArgs;
106 }
107
108 public static function newFromCommandLine( $args, $options ) {
109 $jobOptions = [ 'destClusters' => $args ];
110 foreach ( self::$cmdLineOptionMap as $cmdOption => $classOption ) {
111 if ( isset( $options[$cmdOption] ) ) {
112 $jobOptions[$classOption] = $options[$cmdOption];
113 }
114 }
115
116 return new self( $jobOptions );
117 }
118
119 public function __construct( $options ) {
120 foreach ( $options as $name => $value ) {
121 $this->$name = $value;
122 }
123 $esFactory = MediaWikiServices::getInstance()->getExternalStoreFactory();
124 $this->store = $esFactory->getStore( 'DB' );
125 if ( !$this->isChild ) {
126 $GLOBALS['wgDebugLogPrefix'] = "RCT M: ";
127 } elseif ( $this->childId !== false ) {
128 $GLOBALS['wgDebugLogPrefix'] = "RCT {$this->childId}: ";
129 }
130 $this->pageBlobClass = function_exists( 'xdiff_string_bdiff' ) ?
131 DiffHistoryBlob::class : ConcatenatedGzipHistoryBlob::class;
132 $this->orphanBlobClass = ConcatenatedGzipHistoryBlob::class;
133
134 $this->blobStore = MediaWikiServices::getInstance()
135 ->getBlobStoreFactory()
136 ->newSqlBlobStore();
137 }
138
139 public function debug( $msg ) {
140 wfDebug( "$msg" );
141 if ( $this->debugLog ) {
142 $this->logToFile( $msg, $this->debugLog );
143 }
144 }
145
146 public function info( $msg ) {
147 echo "$msg\n";
148 if ( $this->infoLog ) {
149 $this->logToFile( $msg, $this->infoLog );
150 }
151 }
152
153 public function critical( $msg ) {
154 echo "$msg\n";
155 if ( $this->criticalLog ) {
156 $this->logToFile( $msg, $this->criticalLog );
157 }
158 }
159
160 private function logToFile( $msg, $file ) {
161 $header = '[' . date( 'd\TH:i:s' ) . '] ' . wfHostname() . ' ' . posix_getpid();
162 if ( $this->childId !== false ) {
163 $header .= "({$this->childId})";
164 }
165 $header .= ' ' . WikiMap::getCurrentWikiDbDomain()->getId();
166 LegacyLogger::emit( sprintf( "%-50s %s\n", $header, $msg ), $file );
167 }
168
174 private function syncDBs() {
175 MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication( [ 'timeout' => 100_000 ] );
176 }
177
181 public function execute() {
182 if ( $this->isChild ) {
183 $this->executeChild();
184 } else {
185 $this->executeParent();
186 }
187 }
188
192 public function executeParent() {
193 if ( !$this->checkTrackingTable() ) {
194 return;
195 }
196
197 $this->syncDBs();
198 $this->startChildProcs();
199 $this->doAllPages();
200 $this->doAllOrphans();
201 $this->killChildProcs();
202 }
203
208 private function checkTrackingTable() {
209 $row = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase()->newSelectQueryBuilder()
210 ->select( '*' )
211 ->from( 'blob_tracking' )
212 ->caller( __METHOD__ )->fetchRow();
213 if ( !$row ) {
214 $this->info( "Warning: blob_tracking table contains no rows, skipping this wiki." );
215
216 return false;
217 }
218
219 return true;
220 }
221
228 private function startChildProcs() {
229 $wiki = WikiMap::getCurrentWikiId();
230
231 $cmd = 'php ' . Shell::escape( __FILE__ );
232 foreach ( self::$cmdLineOptionMap as $cmdOption => $classOption ) {
233 if ( $cmdOption == 'child-id' ) {
234 continue;
235 }
236 if ( in_array( $cmdOption, self::$optionsWithArgs ) && isset( $this->$classOption ) ) {
237 // @phan-suppress-next-line PhanTypeMismatchArgument False positive
238 $cmd .= " --$cmdOption " . Shell::escape( $this->$classOption );
239 } elseif ( $this->$classOption ) {
240 $cmd .= " --$cmdOption";
241 }
242 }
243 $cmd .= ' --child' .
244 ' --wiki ' . Shell::escape( $wiki ) .
245 ' ' . Shell::escape( ...$this->destClusters );
246
247 $this->childPipes = $this->childProcs = [];
248 for ( $i = 0; $i < $this->numProcs; $i++ ) {
249 $pipes = [];
250 $spec = [
251 [ 'pipe', 'r' ],
252 [ 'file', 'php://stdout', 'w' ],
253 [ 'file', 'php://stderr', 'w' ]
254 ];
255 AtEase::suppressWarnings();
256 $proc = proc_open( "$cmd --child-id $i", $spec, $pipes );
257 AtEase::restoreWarnings();
258 if ( !$proc ) {
259 $this->critical( "Error opening child process: $cmd" );
260 exit( 1 );
261 }
262 $this->childProcs[$i] = $proc;
263 $this->childPipes[$i] = $pipes[0];
264 }
265 $this->prevChildId = -1;
266 }
267
271 private function killChildProcs() {
272 $this->info( "Waiting for child processes to finish..." );
273 for ( $i = 0; $i < $this->numProcs; $i++ ) {
274 $this->dispatchToChild( $i, 'quit' );
275 }
276 for ( $i = 0; $i < $this->numProcs; $i++ ) {
277 $status = proc_close( $this->childProcs[$i] );
278 if ( $status ) {
279 $this->critical( "Warning: child #$i exited with status $status" );
280 }
281 }
282 $this->info( "Done." );
283 }
284
290 private function dispatch( ...$args ) {
291 $pipes = $this->childPipes;
292 $x = [];
293 $y = [];
294 $numPipes = stream_select( $x, $pipes, $y, 3600 );
295 if ( !$numPipes ) {
296 $this->critical( "Error waiting to write to child process. Aborting" );
297 exit( 1 );
298 }
299 for ( $i = 0; $i < $this->numProcs; $i++ ) {
300 $childId = ( $i + $this->prevChildId + 1 ) % $this->numProcs;
301 if ( isset( $pipes[$childId] ) ) {
302 $this->prevChildId = $childId;
303 $this->dispatchToChild( $childId, $args );
304
305 return;
306 }
307 }
308 $this->critical( "Unreachable" );
309 exit( 1 );
310 }
311
317 private function dispatchToChild( $childId, $args ) {
318 $args = (array)$args;
319 $cmd = implode( ' ', $args );
320 fwrite( $this->childPipes[$childId], "$cmd\n" );
321 }
322
326 private function doAllPages() {
327 $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
328 $i = 0;
329 $startId = 0;
330 if ( $this->noCount ) {
331 $numPages = '[unknown]';
332 } else {
333 $numPages = $dbr->newSelectQueryBuilder()
334 ->select( 'COUNT(DISTINCT bt_page)' )
335 ->from( 'blob_tracking' )
336 ->where( [ 'bt_moved' => 0 ] )
337 ->caller( __METHOD__ )->fetchField();
338 }
339 if ( $this->copyOnly ) {
340 $this->info( "Copying pages..." );
341 } else {
342 $this->info( "Moving pages..." );
343 }
344 while ( true ) {
345 $res = $dbr->newSelectQueryBuilder()
346 ->select( [ 'bt_page' ] )
347 ->distinct()
348 ->from( 'blob_tracking' )
349 ->where( [ 'bt_moved' => 0, $dbr->expr( 'bt_page', '>', $startId ) ] )
350 ->orderBy( 'bt_page' )
351 ->limit( $this->batchSize )
352 ->caller( __METHOD__ )->fetchResultSet();
353 if ( !$res->numRows() ) {
354 break;
355 }
356 foreach ( $res as $row ) {
357 $startId = $row->bt_page;
358 $this->dispatch( 'doPage', $row->bt_page );
359 $i++;
360 }
361 $this->report( 'pages', $i, $numPages );
362 }
363 $this->report( 'pages', $i, $numPages );
364 if ( $this->copyOnly ) {
365 $this->info( "All page copies queued." );
366 } else {
367 $this->info( "All page moves queued." );
368 }
369 }
370
377 private function report( $label, $current, $end ) {
378 $this->numBatches++;
379 if ( $current == $end || $this->numBatches >= $this->reportingInterval ) {
380 $this->numBatches = 0;
381 $this->info( "$label: $current / $end" );
382 MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication();
383 }
384 }
385
389 private function doAllOrphans() {
390 $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
391 $startId = 0;
392 $i = 0;
393 if ( $this->noCount ) {
394 $numOrphans = '[unknown]';
395 } else {
396 $numOrphans = $dbr->newSelectQueryBuilder()
397 ->select( 'COUNT(DISTINCT bt_text_id)' )
398 ->from( 'blob_tracking' )
399 ->where( [ 'bt_moved' => 0, 'bt_page' => 0 ] )
400 ->caller( __METHOD__ )->fetchField();
401 if ( !$numOrphans ) {
402 return;
403 }
404 }
405 if ( $this->copyOnly ) {
406 $this->info( "Copying orphans..." );
407 } else {
408 $this->info( "Moving orphans..." );
409 }
410
411 while ( true ) {
412 $res = $dbr->newSelectQueryBuilder()
413 ->select( [ 'bt_text_id' ] )
414 ->distinct()
415 ->from( 'blob_tracking' )
416 ->where( [ 'bt_moved' => 0, 'bt_page' => 0, $dbr->expr( 'bt_text_id', '>', $startId ) ] )
417 ->orderBy( 'bt_text_id' )
418 ->limit( $this->batchSize )
419 ->caller( __METHOD__ )->fetchResultSet();
420 if ( !$res->numRows() ) {
421 break;
422 }
423 $ids = [];
424 foreach ( $res as $row ) {
425 $startId = $row->bt_text_id;
426 $ids[] = $row->bt_text_id;
427 $i++;
428 }
429 // Need to send enough orphan IDs to the child at a time to fill a blob,
430 // so orphanBatchSize needs to be at least ~100.
431 // batchSize can be smaller or larger.
432 while ( count( $ids ) > $this->orphanBatchSize ) {
433 $args = array_slice( $ids, 0, $this->orphanBatchSize );
434 $ids = array_slice( $ids, $this->orphanBatchSize );
435 array_unshift( $args, 'doOrphanList' );
436 $this->dispatch( ...$args );
437 }
438 if ( count( $ids ) ) {
439 $args = $ids;
440 array_unshift( $args, 'doOrphanList' );
441 $this->dispatch( ...$args );
442 }
443
444 $this->report( 'orphans', $i, $numOrphans );
445 }
446 $this->report( 'orphans', $i, $numOrphans );
447 $this->info( "All orphans queued." );
448 }
449
453 public function executeChild() {
454 $this->debug( 'starting' );
455 $this->syncDBs();
456
457 while ( !feof( STDIN ) ) {
458 $line = rtrim( fgets( STDIN ) );
459 if ( $line == '' ) {
460 continue;
461 }
462 $this->debug( $line );
463 $args = explode( ' ', $line );
464 $cmd = array_shift( $args );
465 switch ( $cmd ) {
466 case 'doPage':
467 $this->doPage( intval( $args[0] ) );
468 break;
469 case 'doOrphanList':
470 $this->doOrphanList( array_map( 'intval', $args ) );
471 break;
472 case 'quit':
473 return;
474 }
475 MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication();
476 }
477 }
478
484 private function doPage( $pageId ) {
485 $title = Title::newFromID( $pageId );
486 if ( $title ) {
487 $titleText = $title->getPrefixedText();
488 } else {
489 $titleText = '[deleted]';
490 }
491 $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
492
493 // Finish any incomplete transactions
494 if ( !$this->copyOnly ) {
495 $this->finishIncompleteMoves( [ 'bt_page' => $pageId ] );
496 $this->syncDBs();
497 }
498
499 $startId = 0;
500 $trx = new CgzCopyTransaction( $this, $this->pageBlobClass );
501
502 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
503 while ( true ) {
504 $res = $dbr->newSelectQueryBuilder()
505 ->select( '*' )
506 ->from( 'blob_tracking' )
507 ->join( 'text', null, 'bt_text_id=old_id' )
508 ->where( [
509 'bt_page' => $pageId,
510 $dbr->expr( 'bt_text_id', '>', $startId ),
511 'bt_moved' => 0,
512 'bt_new_url' => null,
513 ] )
514 ->orderBy( 'bt_text_id' )
515 ->limit( $this->batchSize )
516 ->caller( __METHOD__ )->fetchResultSet();
517 if ( !$res->numRows() ) {
518 break;
519 }
520
521 $lastTextId = 0;
522 foreach ( $res as $row ) {
523 $startId = $row->bt_text_id;
524 if ( $lastTextId == $row->bt_text_id ) {
525 // Duplicate (null edit)
526 continue;
527 }
528 $lastTextId = $row->bt_text_id;
529 // Load the text
530 $text = $this->blobStore->expandBlob( $row->old_text, $row->old_flags );
531 if ( $text === false ) {
532 $this->critical( "Error loading {$row->bt_rev_id}/{$row->bt_text_id}" );
533 continue;
534 }
535
536 // Queue it
537 if ( !$trx->addItem( $text, $row->bt_text_id ) ) {
538 $this->debug( "$titleText: committing blob with " . $trx->getSize() . " items" );
539 $trx->commit();
540 $trx = new CgzCopyTransaction( $this, $this->pageBlobClass );
541 $lbFactory->waitForReplication();
542 }
543 }
544 }
545
546 $this->debug( "$titleText: committing blob with " . $trx->getSize() . " items" );
547 $trx->commit();
548 }
549
563 public function moveTextRow( $textId, $url ) {
564 if ( $this->copyOnly ) {
565 $this->critical( "Internal error: can't call moveTextRow() in --copy-only mode" );
566 exit( 1 );
567 }
568 $dbw = MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase();
569
570 $dbw->begin( __METHOD__ );
571 $dbw->newUpdateQueryBuilder()
572 ->update( 'text' )
573 ->set( [
574 'old_text' => $url,
575 'old_flags' => 'external,utf-8',
576 ] )
577 ->where( [
578 'old_id' => $textId
579 ] )
580 ->caller( __METHOD__ )
581 ->execute();
582 $dbw->newUpdateQueryBuilder()
583 ->update( 'blob_tracking' )
584 ->set( [ 'bt_moved' => 1 ] )
585 ->where( [ 'bt_text_id' => $textId ] )
586 ->caller( __METHOD__ )
587 ->execute();
588 $dbw->commit( __METHOD__ );
589 }
590
601 private function finishIncompleteMoves( $conds ) {
602 $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
603 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
604
605 $startId = 0;
606 $conds = array_merge( $conds, [
607 'bt_moved' => 0,
608 'bt_new_url IS NOT NULL'
609 ] );
610 while ( true ) {
611 $res = $dbr->newSelectQueryBuilder()
612 ->select( '*' )
613 ->from( 'blob_tracking' )
614 ->where( $conds )
615 ->andWhere( $dbr->expr( 'bt_text_id', '>', $startId ) )
616 ->orderBy( 'bt_text_id' )
617 ->limit( $this->batchSize )
618 ->caller( __METHOD__ )->fetchResultSet();
619 if ( !$res->numRows() ) {
620 break;
621 }
622 $this->debug( 'Incomplete: ' . $res->numRows() . ' rows' );
623 foreach ( $res as $row ) {
624 $startId = $row->bt_text_id;
625 $this->moveTextRow( $row->bt_text_id, $row->bt_new_url );
626 if ( $row->bt_text_id % 10 == 0 ) {
627 $lbFactory->waitForReplication();
628 }
629 }
630 }
631 }
632
637 public function getTargetCluster() {
638 $cluster = next( $this->destClusters );
639 if ( $cluster === false ) {
640 $cluster = reset( $this->destClusters );
641 }
642
643 return $cluster;
644 }
645
651 private function doOrphanList( $textIds ) {
652 // Finish incomplete moves
653 if ( !$this->copyOnly ) {
654 $this->finishIncompleteMoves( [ 'bt_text_id' => $textIds ] );
655 $this->syncDBs();
656 }
657
658 $trx = new CgzCopyTransaction( $this, $this->orphanBlobClass );
659
660 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
661 $res = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase()->newSelectQueryBuilder()
662 ->select( [ 'old_id', 'old_text', 'old_flags' ] )
663 ->distinct()
664 ->from( 'text' )
665 ->join( 'blob_tracking', null, 'bt_text_id=old_id' )
666 ->where( [ 'old_id' => $textIds, 'bt_moved' => 0 ] )
667 ->caller( __METHOD__ )->fetchResultSet();
668
669 foreach ( $res as $row ) {
670 $text = $this->blobStore->expandBlob( $row->old_text, $row->old_flags );
671 if ( $text === false ) {
672 $this->critical( "Error: cannot load revision text for old_id={$row->old_id}" );
673 continue;
674 }
675
676 if ( !$trx->addItem( $text, $row->old_id ) ) {
677 $this->debug( "[orphan]: committing blob with " . $trx->getSize() . " rows" );
678 $trx->commit();
679 $trx = new CgzCopyTransaction( $this, $this->orphanBlobClass );
680 $lbFactory->waitForReplication();
681 }
682 }
683 $this->debug( "[orphan]: committing blob with " . $trx->getSize() . " rows" );
684 $trx->commit();
685 }
686}
687
693 public $parent;
696 public $cgz;
699 private $texts;
700
706 public function __construct( $parent, $blobClass ) {
707 $this->blobClass = $blobClass;
708 $this->cgz = false;
709 $this->texts = [];
710 $this->parent = $parent;
711 }
712
720 public function addItem( $text, $textId ) {
721 if ( !$this->cgz ) {
722 $class = $this->blobClass;
723 $this->cgz = new $class;
724 }
725 $hash = $this->cgz->addItem( $text );
726 $this->referrers[$textId] = $hash;
727 $this->texts[$textId] = $text;
728
729 return $this->cgz->isHappy();
730 }
731
732 public function getSize() {
733 return count( $this->texts );
734 }
735
739 public function recompress() {
740 $class = $this->blobClass;
741 $this->cgz = new $class;
742 $this->referrers = [];
743 foreach ( $this->texts as $textId => $text ) {
744 $hash = $this->cgz->addItem( $text );
745 $this->referrers[$textId] = $hash;
746 }
747 }
748
754 public function commit() {
755 $originalCount = count( $this->texts );
756 if ( !$originalCount ) {
757 return;
758 }
759
760 /* Check to see if the target text_ids have been moved already.
761 *
762 * We originally read from the replica DB, so this can happen when a single
763 * text_id is shared between multiple pages. It's rare, but possible
764 * if a delete/move/undelete cycle splits up a null edit.
765 *
766 * We do a locking read to prevent closer-run race conditions.
767 */
768 $dbw = MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase();
769 $dbw->begin( __METHOD__ );
770 $res = $dbw->newSelectQueryBuilder()
771 ->select( [ 'bt_text_id', 'bt_moved' ] )
772 ->forUpdate()
773 ->from( 'blob_tracking' )
774 ->where( [ 'bt_text_id' => array_keys( $this->referrers ) ] )
775 ->caller( __METHOD__ )->fetchResultSet();
776 $dirty = false;
777 foreach ( $res as $row ) {
778 if ( $row->bt_moved ) {
779 # This row has already been moved, remove it
780 $this->parent->debug( "TRX: conflict detected in old_id={$row->bt_text_id}" );
781 unset( $this->texts[$row->bt_text_id] );
782 $dirty = true;
783 }
784 }
785
786 // Recompress the blob if necessary
787 if ( $dirty ) {
788 if ( !count( $this->texts ) ) {
789 // All have been moved already
790 if ( $originalCount > 1 ) {
791 // This is suspcious, make noise
792 $this->parent->critical(
793 "Warning: concurrent operation detected, are there two conflicting " .
794 "processes running, doing the same job?" );
795 }
796
797 return;
798 }
799 $this->recompress();
800 }
801
802 // Insert the data into the destination cluster
803 $targetCluster = $this->parent->getTargetCluster();
804 $store = $this->parent->store;
805 $targetDB = $store->getPrimary( $targetCluster );
806 $targetDB->clearFlag( DBO_TRX ); // we manage the transactions
807 $targetDB->begin( __METHOD__ );
808 $baseUrl = $this->parent->store->store( $targetCluster, serialize( $this->cgz ) );
809
810 // Write the new URLs to the blob_tracking table
811 foreach ( $this->referrers as $textId => $hash ) {
812 $url = $baseUrl . '/' . $hash;
813 $dbw->newUpdateQueryBuilder()
814 ->update( 'blob_tracking' )
815 ->set( [ 'bt_new_url' => $url ] )
816 ->where( [
817 'bt_text_id' => $textId,
818 'bt_moved' => 0, # Check for concurrent conflicting update
819 ] )
820 ->caller( __METHOD__ )
821 ->execute();
822 }
823
824 $targetDB->commit( __METHOD__ );
825 // Critical section here: interruption at this point causes blob duplication
826 // Reversing the order of the commits would cause data loss instead
827 $dbw->commit( __METHOD__ );
828
829 // Write the new URLs to the text table and set the moved flag
830 if ( !$this->parent->copyOnly ) {
831 foreach ( $this->referrers as $textId => $hash ) {
832 $url = $baseUrl . '/' . $hash;
833 $this->parent->moveTextRow( $textId, $url );
834 }
835 }
836 }
837}
wfDebug( $text, $dest='all', array $context=[])
Sends a line to the debug log if enabled or, optionally, to a comment in output.
wfHostname()
Get host name of the current machine, for use in error reporting.
Class to represent a recompression operation for a single CGZ blob.
RecompressTracked $parent
ConcatenatedGzipHistoryBlob false $cgz
addItem( $text, $textId)
Add text.
commit()
Commit the blob.
recompress()
Recompress text after some aberrant modification.
__construct( $parent, $blobClass)
Create a transaction from a RecompressTracked object.
Concatenated gzip (CGZ) storage Improves compression ratio by concatenating like objects before gzipp...
External storage in a SQL database.
getPrimary( $cluster)
Get a primary database connection for the specified cluster.
store( $location, $data)
Insert a data item into a given location.string|bool The URL of the stored data item,...
PSR-3 logger that mimics the historic implementation of MediaWiki's former wfErrorLog logging impleme...
Service locator for MediaWiki core services.
Executes shell commands.
Definition Shell.php:46
Service for storing and loading Content objects representing revision data blobs.
Represents a title within MediaWiki.
Definition Title.php:79
Tools for dealing with other locally-hosted wikis.
Definition WikiMap.php:31
Maintenance script that moves blobs indexed by trackBlobs.php to a specified list of destination clus...
executeChild()
Main entry point for worker processes.
moveTextRow( $textId, $url)
Atomic move operation.
execute()
Execute parent or child depending on the isChild option.
static newFromCommandLine( $args, $options)
getTargetCluster()
Returns the name of the next target cluster.
executeParent()
Execute the parent process.
ExternalStoreDB $store
const DBO_TRX
Definition defines.php:12
$optionsWithArgs
if(count( $args)< 1) $job
$header