MediaWiki REL1_35
recompressTracked.php
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1<?php
30
32require __DIR__ . '/../commandLine.inc';
33
34if ( count( $args ) < 1 ) {
35 echo "Usage: php recompressTracked.php [options] <cluster> [... <cluster>...]
36Moves blobs indexed by trackBlobs.php to a specified list of destination clusters,
37and recompresses them in the process. Restartable.
38
39Options:
40 --procs <procs> Set the number of child processes (default 1)
41 --copy-only Copy only, do not update the text table. Restart
42 without this option to complete.
43 --debug-log <file> Log debugging data to the specified file
44 --info-log <file> Log progress messages to the specified file
45 --critical-log <file> Log error messages to the specified file
46";
47 exit( 1 );
48}
49
51$job->execute();
52
61 public $batchSize = 1000;
62 public $orphanBatchSize = 1000;
63 public $reportingInterval = 10;
64 public $numProcs = 1;
65 public $numBatches = 0;
68 public $copyOnly = false;
69 public $isChild = false;
70 public $childId = false;
71 public $noCount = false;
74 public $store;
76 private $blobStore;
77
78 private static $optionsWithArgs = [
79 'procs',
80 'child-id',
81 'debug-log',
82 'info-log',
83 'critical-log'
84 ];
85
86 private static $cmdLineOptionMap = [
87 'no-count' => 'noCount',
88 'procs' => 'numProcs',
89 'copy-only' => 'copyOnly',
90 'child' => 'isChild',
91 'child-id' => 'childId',
92 'debug-log' => 'debugLog',
93 'info-log' => 'infoLog',
94 'critical-log' => 'criticalLog',
95 ];
96
97 public static function getOptionsWithArgs() {
99 }
100
101 public static function newFromCommandLine( $args, $options ) {
102 $jobOptions = [ 'destClusters' => $args ];
103 foreach ( self::$cmdLineOptionMap as $cmdOption => $classOption ) {
104 if ( isset( $options[$cmdOption] ) ) {
105 $jobOptions[$classOption] = $options[$cmdOption];
106 }
107 }
108
109 return new self( $jobOptions );
110 }
111
112 public function __construct( $options ) {
113 foreach ( $options as $name => $value ) {
114 $this->$name = $value;
115 }
116 $esFactory = MediaWikiServices::getInstance()->getExternalStoreFactory();
117 $this->store = $esFactory->getStore( 'DB' );
118 if ( !$this->isChild ) {
119 $GLOBALS['wgDebugLogPrefix'] = "RCT M: ";
120 } elseif ( $this->childId !== false ) {
121 $GLOBALS['wgDebugLogPrefix'] = "RCT {$this->childId}: ";
122 }
123 $this->pageBlobClass = function_exists( 'xdiff_string_bdiff' ) ?
124 DiffHistoryBlob::class : ConcatenatedGzipHistoryBlob::class;
125 $this->orphanBlobClass = ConcatenatedGzipHistoryBlob::class;
126
127 $this->blobStore = MediaWikiServices::getInstance()
128 ->getBlobStoreFactory()
129 ->newSqlBlobStore();
130 }
131
132 public function debug( $msg ) {
133 wfDebug( "$msg" );
134 if ( $this->debugLog ) {
135 $this->logToFile( $msg, $this->debugLog );
136 }
137 }
138
139 public function info( $msg ) {
140 echo "$msg\n";
141 if ( $this->infoLog ) {
142 $this->logToFile( $msg, $this->infoLog );
143 }
144 }
145
146 public function critical( $msg ) {
147 echo "$msg\n";
148 if ( $this->criticalLog ) {
149 $this->logToFile( $msg, $this->criticalLog );
150 }
151 }
152
153 private function logToFile( $msg, $file ) {
154 $header = '[' . date( 'd\TH:i:s' ) . '] ' . wfHostname() . ' ' . posix_getpid();
155 if ( $this->childId !== false ) {
156 $header .= "({$this->childId})";
157 }
158 $header .= ' ' . WikiMap::getCurrentWikiDbDomain()->getId();
159 LegacyLogger::emit( sprintf( "%-50s %s\n", $header, $msg ), $file );
160 }
161
167 private function syncDBs() {
168 $dbw = wfGetDB( DB_MASTER );
170 $pos = $dbw->getMasterPos();
171 $dbr->masterPosWait( $pos, 100000 );
172 }
173
177 public function execute() {
178 if ( $this->isChild ) {
179 $this->executeChild();
180 } else {
181 $this->executeParent();
182 }
183 }
184
188 public function executeParent() {
189 if ( !$this->checkTrackingTable() ) {
190 return;
191 }
192
193 $this->syncDBs();
194 $this->startChildProcs();
195 $this->doAllPages();
196 $this->doAllOrphans();
197 $this->killChildProcs();
198 }
199
204 private function checkTrackingTable() {
206 if ( !$dbr->tableExists( 'blob_tracking', __METHOD__ ) ) {
207 $this->critical( "Error: blob_tracking table does not exist" );
208
209 return false;
210 }
211 $row = $dbr->selectRow( 'blob_tracking', '*', '', __METHOD__ );
212 if ( !$row ) {
213 $this->info( "Warning: blob_tracking table contains no rows, skipping this wiki." );
214
215 return false;
216 }
217
218 return true;
219 }
220
227 private function startChildProcs() {
228 $wiki = WikiMap::getCurrentWikiId();
229
230 $cmd = 'php ' . Shell::escape( __FILE__ );
231 foreach ( self::$cmdLineOptionMap as $cmdOption => $classOption ) {
232 if ( $cmdOption == 'child-id' ) {
233 continue;
234 } elseif ( in_array( $cmdOption, self::$optionsWithArgs ) && isset( $this->$classOption ) ) {
235 $cmd .= " --$cmdOption " . Shell::escape( $this->$classOption );
236 } elseif ( $this->$classOption ) {
237 $cmd .= " --$cmdOption";
238 }
239 }
240 $cmd .= ' --child' .
241 ' --wiki ' . Shell::escape( $wiki ) .
242 ' ' . Shell::escape( ...$this->destClusters );
243
244 $this->childPipes = $this->childProcs = [];
245 for ( $i = 0; $i < $this->numProcs; $i++ ) {
246 $pipes = [];
247 $spec = [
248 [ 'pipe', 'r' ],
249 [ 'file', 'php://stdout', 'w' ],
250 [ 'file', 'php://stderr', 'w' ]
251 ];
252 Wikimedia\suppressWarnings();
253 $proc = proc_open( "$cmd --child-id $i", $spec, $pipes );
254 Wikimedia\restoreWarnings();
255 if ( !$proc ) {
256 $this->critical( "Error opening child process: $cmd" );
257 exit( 1 );
258 }
259 $this->childProcs[$i] = $proc;
260 $this->childPipes[$i] = $pipes[0];
261 }
262 $this->prevChildId = -1;
263 }
264
268 private function killChildProcs() {
269 $this->info( "Waiting for child processes to finish..." );
270 for ( $i = 0; $i < $this->numProcs; $i++ ) {
271 $this->dispatchToChild( $i, 'quit' );
272 }
273 for ( $i = 0; $i < $this->numProcs; $i++ ) {
274 $status = proc_close( $this->childProcs[$i] );
275 if ( $status ) {
276 $this->critical( "Warning: child #$i exited with status $status" );
277 }
278 }
279 $this->info( "Done." );
280 }
281
287 private function dispatch( ...$args ) {
288 $pipes = $this->childPipes;
289 $x = [];
290 $y = [];
291 $numPipes = stream_select( $x, $pipes, $y, 3600 );
292 if ( !$numPipes ) {
293 $this->critical( "Error waiting to write to child process. Aborting" );
294 exit( 1 );
295 }
296 for ( $i = 0; $i < $this->numProcs; $i++ ) {
297 $childId = ( $i + $this->prevChildId + 1 ) % $this->numProcs;
298 if ( isset( $pipes[$childId] ) ) {
299 $this->prevChildId = $childId;
300 $this->dispatchToChild( $childId, $args );
301
302 return;
303 }
304 }
305 $this->critical( "Unreachable" );
306 exit( 1 );
307 }
308
314 private function dispatchToChild( $childId, $args ) {
315 $args = (array)$args;
316 $cmd = implode( ' ', $args );
317 fwrite( $this->childPipes[$childId], "$cmd\n" );
318 }
319
323 private function doAllPages() {
325 $i = 0;
326 $startId = 0;
327 if ( $this->noCount ) {
328 $numPages = '[unknown]';
329 } else {
330 $numPages = $dbr->selectField( 'blob_tracking',
331 'COUNT(DISTINCT bt_page)',
332 # A condition is required so that this query uses the index
333 [ 'bt_moved' => 0 ],
334 __METHOD__
335 );
336 }
337 if ( $this->copyOnly ) {
338 $this->info( "Copying pages..." );
339 } else {
340 $this->info( "Moving pages..." );
341 }
342 while ( true ) {
343 $res = $dbr->select( 'blob_tracking',
344 [ 'bt_page' ],
345 [
346 'bt_moved' => 0,
347 'bt_page > ' . $dbr->addQuotes( $startId )
348 ],
349 __METHOD__,
350 [
351 'DISTINCT',
352 'ORDER BY' => 'bt_page',
353 'LIMIT' => $this->batchSize,
354 ]
355 );
356 if ( !$res->numRows() ) {
357 break;
358 }
359 foreach ( $res as $row ) {
360 $startId = $row->bt_page;
361 $this->dispatch( 'doPage', $row->bt_page );
362 $i++;
363 }
364 $this->report( 'pages', $i, $numPages );
365 }
366 $this->report( 'pages', $i, $numPages );
367 if ( $this->copyOnly ) {
368 $this->info( "All page copies queued." );
369 } else {
370 $this->info( "All page moves queued." );
371 }
372 }
373
380 private function report( $label, $current, $end ) {
381 $this->numBatches++;
382 if ( $current == $end || $this->numBatches >= $this->reportingInterval ) {
383 $this->numBatches = 0;
384 $this->info( "$label: $current / $end" );
385 MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication();
386 }
387 }
388
392 private function doAllOrphans() {
394 $startId = 0;
395 $i = 0;
396 if ( $this->noCount ) {
397 $numOrphans = '[unknown]';
398 } else {
399 $numOrphans = $dbr->selectField( 'blob_tracking',
400 'COUNT(DISTINCT bt_text_id)',
401 [ 'bt_moved' => 0, 'bt_page' => 0 ],
402 __METHOD__ );
403 if ( !$numOrphans ) {
404 return;
405 }
406 }
407 if ( $this->copyOnly ) {
408 $this->info( "Copying orphans..." );
409 } else {
410 $this->info( "Moving orphans..." );
411 }
412
413 while ( true ) {
414 $res = $dbr->select( 'blob_tracking',
415 [ 'bt_text_id' ],
416 [
417 'bt_moved' => 0,
418 'bt_page' => 0,
419 'bt_text_id > ' . $dbr->addQuotes( $startId )
420 ],
421 __METHOD__,
422 [
423 'DISTINCT',
424 'ORDER BY' => 'bt_text_id',
425 'LIMIT' => $this->batchSize
426 ]
427 );
428 if ( !$res->numRows() ) {
429 break;
430 }
431 $ids = [];
432 foreach ( $res as $row ) {
433 $startId = $row->bt_text_id;
434 $ids[] = $row->bt_text_id;
435 $i++;
436 }
437 // Need to send enough orphan IDs to the child at a time to fill a blob,
438 // so orphanBatchSize needs to be at least ~100.
439 // batchSize can be smaller or larger.
440 while ( count( $ids ) > $this->orphanBatchSize ) {
441 $args = array_slice( $ids, 0, $this->orphanBatchSize );
442 $ids = array_slice( $ids, $this->orphanBatchSize );
443 array_unshift( $args, 'doOrphanList' );
444 $this->dispatch( ...$args );
445 }
446 if ( count( $ids ) ) {
447 $args = $ids;
448 array_unshift( $args, 'doOrphanList' );
449 $this->dispatch( ...$args );
450 }
451
452 $this->report( 'orphans', $i, $numOrphans );
453 }
454 $this->report( 'orphans', $i, $numOrphans );
455 $this->info( "All orphans queued." );
456 }
457
461 public function executeChild() {
462 $this->debug( 'starting' );
463 $this->syncDBs();
464
465 while ( !feof( STDIN ) ) {
466 $line = rtrim( fgets( STDIN ) );
467 if ( $line == '' ) {
468 continue;
469 }
470 $this->debug( $line );
471 $args = explode( ' ', $line );
472 $cmd = array_shift( $args );
473 switch ( $cmd ) {
474 case 'doPage':
475 $this->doPage( intval( $args[0] ) );
476 break;
477 case 'doOrphanList':
478 $this->doOrphanList( array_map( 'intval', $args ) );
479 break;
480 case 'quit':
481 return;
482 }
483 MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->waitForReplication();
484 }
485 }
486
492 private function doPage( $pageId ) {
493 $title = Title::newFromID( $pageId );
494 if ( $title ) {
495 $titleText = $title->getPrefixedText();
496 } else {
497 $titleText = '[deleted]';
498 }
500
501 // Finish any incomplete transactions
502 if ( !$this->copyOnly ) {
503 $this->finishIncompleteMoves( [ 'bt_page' => $pageId ] );
504 $this->syncDBs();
505 }
506
507 $startId = 0;
508 $trx = new CgzCopyTransaction( $this, $this->pageBlobClass );
509
510 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
511 while ( true ) {
512 $res = $dbr->select(
513 [ 'blob_tracking', 'text' ],
514 '*',
515 [
516 'bt_page' => $pageId,
517 'bt_text_id > ' . $dbr->addQuotes( $startId ),
518 'bt_moved' => 0,
519 'bt_new_url IS NULL',
520 'bt_text_id=old_id',
521 ],
522 __METHOD__,
523 [
524 'ORDER BY' => 'bt_text_id',
525 'LIMIT' => $this->batchSize
526 ]
527 );
528 if ( !$res->numRows() ) {
529 break;
530 }
531
532 $lastTextId = 0;
533 foreach ( $res as $row ) {
534 $startId = $row->bt_text_id;
535 if ( $lastTextId == $row->bt_text_id ) {
536 // Duplicate (null edit)
537 continue;
538 }
539 $lastTextId = $row->bt_text_id;
540 // Load the text
541 $text = $this->blobStore->expandBlob( $row->old_text, $row->old_flags );
542 if ( $text === false ) {
543 $this->critical( "Error loading {$row->bt_rev_id}/{$row->bt_text_id}" );
544 continue;
545 }
546
547 // Queue it
548 if ( !$trx->addItem( $text, $row->bt_text_id ) ) {
549 $this->debug( "$titleText: committing blob with " . $trx->getSize() . " items" );
550 $trx->commit();
551 $trx = new CgzCopyTransaction( $this, $this->pageBlobClass );
552 $lbFactory->waitForReplication();
553 }
554 }
555 }
556
557 $this->debug( "$titleText: committing blob with " . $trx->getSize() . " items" );
558 $trx->commit();
559 }
560
574 public function moveTextRow( $textId, $url ) {
575 if ( $this->copyOnly ) {
576 $this->critical( "Internal error: can't call moveTextRow() in --copy-only mode" );
577 exit( 1 );
578 }
579 $dbw = wfGetDB( DB_MASTER );
580 $dbw->begin( __METHOD__ );
581 $dbw->update( 'text',
582 [ // set
583 'old_text' => $url,
584 'old_flags' => 'external,utf-8',
585 ],
586 [ // where
587 'old_id' => $textId
588 ],
589 __METHOD__
590 );
591 $dbw->update( 'blob_tracking',
592 [ 'bt_moved' => 1 ],
593 [ 'bt_text_id' => $textId ],
594 __METHOD__
595 );
596 $dbw->commit( __METHOD__ );
597 }
598
609 private function finishIncompleteMoves( $conds ) {
611 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
612
613 $startId = 0;
614 $conds = array_merge( $conds, [
615 'bt_moved' => 0,
616 'bt_new_url IS NOT NULL'
617 ] );
618 while ( true ) {
619 $res = $dbr->select( 'blob_tracking',
620 '*',
621 array_merge( $conds, [ 'bt_text_id > ' . $dbr->addQuotes( $startId ) ] ),
622 __METHOD__,
623 [
624 'ORDER BY' => 'bt_text_id',
625 'LIMIT' => $this->batchSize,
626 ]
627 );
628 if ( !$res->numRows() ) {
629 break;
630 }
631 $this->debug( 'Incomplete: ' . $res->numRows() . ' rows' );
632 foreach ( $res as $row ) {
633 $startId = $row->bt_text_id;
634 $this->moveTextRow( $row->bt_text_id, $row->bt_new_url );
635 if ( $row->bt_text_id % 10 == 0 ) {
636 $lbFactory->waitForReplication();
637 }
638 }
639 }
640 }
641
646 public function getTargetCluster() {
647 $cluster = next( $this->destClusters );
648 if ( $cluster === false ) {
649 $cluster = reset( $this->destClusters );
650 }
651
652 return $cluster;
653 }
654
660 private function getExtDB( $cluster ) {
661 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
662 $lb = $lbFactory->getExternalLB( $cluster );
663
664 return $lb->getMaintenanceConnectionRef( DB_MASTER );
665 }
666
672 private function doOrphanList( $textIds ) {
673 // Finish incomplete moves
674 if ( !$this->copyOnly ) {
675 $this->finishIncompleteMoves( [ 'bt_text_id' => $textIds ] );
676 $this->syncDBs();
677 }
678
679 $trx = new CgzCopyTransaction( $this, $this->orphanBlobClass );
680
681 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
682 $res = wfGetDB( DB_REPLICA )->select(
683 [ 'text', 'blob_tracking' ],
684 [ 'old_id', 'old_text', 'old_flags' ],
685 [
686 'old_id' => $textIds,
687 'bt_text_id=old_id',
688 'bt_moved' => 0,
689 ],
690 __METHOD__,
691 [ 'DISTINCT' ]
692 );
693
694 foreach ( $res as $row ) {
695 $text = $this->blobStore->expandBlob( $row->old_text, $row->old_flags );
696 if ( $text === false ) {
697 $this->critical( "Error: cannot load revision text for old_id={$row->old_id}" );
698 continue;
699 }
700
701 if ( !$trx->addItem( $text, $row->old_id ) ) {
702 $this->debug( "[orphan]: committing blob with " . $trx->getSize() . " rows" );
703 $trx->commit();
704 $trx = new CgzCopyTransaction( $this, $this->orphanBlobClass );
705 $lbFactory->waitForReplication();
706 }
707 }
708 $this->debug( "[orphan]: committing blob with " . $trx->getSize() . " rows" );
709 $trx->commit();
710 }
711}
712
718 public $parent;
721 public $cgz;
724 private $texts;
725
731 public function __construct( $parent, $blobClass ) {
732 $this->blobClass = $blobClass;
733 $this->cgz = false;
734 $this->texts = [];
735 $this->parent = $parent;
736 }
737
745 public function addItem( $text, $textId ) {
746 if ( !$this->cgz ) {
747 $class = $this->blobClass;
748 $this->cgz = new $class;
749 }
750 $hash = $this->cgz->addItem( $text );
751 $this->referrers[$textId] = $hash;
752 $this->texts[$textId] = $text;
753
754 return $this->cgz->isHappy();
755 }
756
757 public function getSize() {
758 return count( $this->texts );
759 }
760
764 public function recompress() {
765 $class = $this->blobClass;
766 $this->cgz = new $class;
767 $this->referrers = [];
768 foreach ( $this->texts as $textId => $text ) {
769 $hash = $this->cgz->addItem( $text );
770 $this->referrers[$textId] = $hash;
771 }
772 }
773
779 public function commit() {
780 $originalCount = count( $this->texts );
781 if ( !$originalCount ) {
782 return;
783 }
784
785 /* Check to see if the target text_ids have been moved already.
786 *
787 * We originally read from the replica DB, so this can happen when a single
788 * text_id is shared between multiple pages. It's rare, but possible
789 * if a delete/move/undelete cycle splits up a null edit.
790 *
791 * We do a locking read to prevent closer-run race conditions.
792 */
793 $dbw = wfGetDB( DB_MASTER );
794 $dbw->begin( __METHOD__ );
795 $res = $dbw->select( 'blob_tracking',
796 [ 'bt_text_id', 'bt_moved' ],
797 [ 'bt_text_id' => array_keys( $this->referrers ) ],
798 __METHOD__, [ 'FOR UPDATE' ] );
799 $dirty = false;
800 foreach ( $res as $row ) {
801 if ( $row->bt_moved ) {
802 # This row has already been moved, remove it
803 $this->parent->debug( "TRX: conflict detected in old_id={$row->bt_text_id}" );
804 unset( $this->texts[$row->bt_text_id] );
805 $dirty = true;
806 }
807 }
808
809 // Recompress the blob if necessary
810 if ( $dirty ) {
811 if ( !count( $this->texts ) ) {
812 // All have been moved already
813 if ( $originalCount > 1 ) {
814 // This is suspcious, make noise
815 $this->parent->critical(
816 "Warning: concurrent operation detected, are there two conflicting " .
817 "processes running, doing the same job?" );
818 }
819
820 return;
821 }
822 $this->recompress();
823 }
824
825 // Insert the data into the destination cluster
826 $targetCluster = $this->parent->getTargetCluster();
827 $store = $this->parent->store;
828 $targetDB = $store->getMaster( $targetCluster );
829 $targetDB->clearFlag( DBO_TRX ); // we manage the transactions
830 $targetDB->begin( __METHOD__ );
831 $baseUrl = $this->parent->store->store( $targetCluster, serialize( $this->cgz ) );
832
833 // Write the new URLs to the blob_tracking table
834 foreach ( $this->referrers as $textId => $hash ) {
835 $url = $baseUrl . '/' . $hash;
836 $dbw->update( 'blob_tracking',
837 [ 'bt_new_url' => $url ],
838 [
839 'bt_text_id' => $textId,
840 'bt_moved' => 0, # Check for concurrent conflicting update
841 ],
842 __METHOD__
843 );
844 }
845
846 $targetDB->commit( __METHOD__ );
847 // Critical section here: interruption at this point causes blob duplication
848 // Reversing the order of the commits would cause data loss instead
849 $dbw->commit( __METHOD__ );
850
851 // Write the new URLs to the text table and set the moved flag
852 if ( !$this->parent->copyOnly ) {
853 foreach ( $this->referrers as $textId => $hash ) {
854 $url = $baseUrl . '/' . $hash;
855 $this->parent->moveTextRow( $textId, $url );
856 }
857 }
858 }
859}
serialize()
$GLOBALS['IP']
wfDebug( $text, $dest='all', array $context=[])
Sends a line to the debug log if enabled or, optionally, to a comment in output.
wfGetDB( $db, $groups=[], $wiki=false)
Get a Database object.
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...
DB accessible external objects.
PSR-3 logger that mimics the historic implementation of MediaWiki's former wfErrorLog logging impleme...
MediaWikiServices is the service locator for the application scope of MediaWiki.
Executes shell commands.
Definition Shell.php:44
Service for storing and loading Content objects.
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.
killChildProcs()
Gracefully terminate the child processes.
report( $label, $current, $end)
Display a progress report.
execute()
Execute parent or child depending on the isChild option.
getExtDB( $cluster)
Gets a DB master connection for the given external cluster name.
doOrphanList( $textIds)
Move an orphan text_id to the new cluster.
startChildProcs()
Start the worker processes.
doAllOrphans()
Move all orphan text to the new clusters.
static newFromCommandLine( $args, $options)
finishIncompleteMoves( $conds)
Moves are done in two phases: bt_new_url and then bt_moved.
dispatch(... $args)
Dispatch a command to the next available child process.
doPage( $pageId)
Move tracked text in a given page.
syncDBs()
Wait until the selected replica DB has caught up to the master.
dispatchToChild( $childId, $args)
Dispatch a command to a specified child process.
getTargetCluster()
Returns the name of the next target cluster.
executeParent()
Execute the parent process.
doAllPages()
Move all tracked pages to the new clusters.
ExternalStoreDB $store
checkTrackingTable()
Make sure the tracking table exists and isn't empty.
Advanced database interface for IDatabase handles that include maintenance methods.
$line
Definition mcc.php:119
if( $line===false) $args
Definition mcc.php:124
const DB_REPLICA
Definition defines.php:25
const DB_MASTER
Definition defines.php:29
const DBO_TRX
Definition defines.php:12
$optionsWithArgs
if(count( $args)< 1) $job
if(PHP_SAPI !='cli-server') if(!isset( $_SERVER['SCRIPT_FILENAME'])) $file
Item class for a filearchive table row.
Definition router.php:42
$header