diff options
Diffstat (limited to 'maintenance/storage/compressOld.inc')
| -rw-r--r-- | maintenance/storage/compressOld.inc | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/maintenance/storage/compressOld.inc b/maintenance/storage/compressOld.inc new file mode 100644 index 000000000000..344a490f2875 --- /dev/null +++ b/maintenance/storage/compressOld.inc @@ -0,0 +1,246 @@ +<?php +/** + * @package MediaWiki + * @subpackage Maintenance + */ + +/** */ +require_once( 'Revision.php' ); +require_once( 'ExternalStoreDB.php' ); + +/** @todo document */ +function compressOldPages( $start = 0, $extdb = '' ) { + $fname = 'compressOldPages'; + + $chunksize = 50; + print "Starting from old_id $start...\n"; + $dbw =& wfGetDB( DB_MASTER ); + do { + $end = $start + $chunksize; + $res = $dbw->select( 'text', array( 'old_id','old_flags','old_namespace','old_title','old_text' ), + "old_id>=$start", $fname, array( 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ) ); + if( $dbw->numRows( $res ) == 0 ) { + break; + } + $last = $start; + while( $row = $dbw->fetchObject( $res ) ) { + # print " {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n"; + compressPage( $row, $extdb ); + $last = $row->old_id; + } + $dbw->freeResult( $res ); + $start = $last + 1; # Deletion may leave long empty stretches + print "$start...\n"; + } while( true ); +} + +/** @todo document */ +function compressPage( $row, $extdb ) { + $fname = 'compressPage'; + if ( false !== strpos( $row->old_flags, 'gzip' ) || false !== strpos( $row->old_flags, 'object' ) ) { + #print "Already compressed row {$row->old_id}\n"; + return false; + } + $dbw =& wfGetDB( DB_MASTER ); + $flags = $row->old_flags ? "{$row->old_flags},gzip" : "gzip"; + $compress = gzdeflate( $row->old_text ); + + # Store in external storage if required + if ( $extdb !== '' ) { + $storeObj = new ExternalStoreDB; + $compress = $storeObj->store( $extdb, $compress ); + if ( $compress === false ) { + print "Unable to store object\n"; + return false; + } + } + + # Update text row + $dbw->update( 'text', + array( /* SET */ + 'old_flags' => $flags, + 'old_text' => $compress + ), array( /* WHERE */ + 'old_id' => $row->old_id + ), $fname, 'LIMIT 1' + ); + return true; +} + +define( 'LS_INDIVIDUAL', 0 ); +define( 'LS_CHUNKED', 1 ); + +/** @todo document */ +function compressWithConcat( $startId, $maxChunkSize, $maxChunkFactor, $factorThreshold, $beginDate, $endDate ) +{ + $fname = 'compressWithConcat'; + $loadStyle = LS_CHUNKED; + + $dbr =& wfGetDB( DB_SLAVE ); + $dbw =& wfGetDB( DB_MASTER ); + + # Get all articles by page_id + $maxPageId = $dbr->selectField( 'page', 'max(page_id)', '', $fname ); + $pageConds = array(); + + /* + if ( $exclude_ns0 ) { + print "Excluding main namespace\n"; + $pageConds[] = 'page_namespace<>0'; + } + if ( $queryExtra ) { + $pageConds[] = $queryExtra; + } + */ + + # For each article, get a list of revisions which fit the criteria + # No recompression, use a condition on old_flags + $conds = array( + "old_flags NOT LIKE '%object%' " . + " AND (old_flags NOT LIKE '%external%' OR old_text NOT LIKE 'DB://%/%/%')"); + + if ( $beginDate ) { + $conds[] = "rev_timestamp>'" . $beginDate . "'"; + } + if ( $endDate ) { + $conds[] = "rev_timestamp<'" . $endDate . "'"; + } + if ( $loadStyle == LS_CHUNKED ) { + $tables = array( 'revision', 'text' ); + $fields = array( 'rev_id', 'rev_text_id', 'old_flags', 'old_text' ); + $conds[] = 'rev_text_id=old_id'; + $revLoadOptions = 'FOR UPDATE'; + } else { + $tables = array( 'revision' ); + $fields = array( 'rev_id', 'rev_text_id' ); + $revLoadOptions = array(); + } + + $oldReadsSinceLastSlaveWait = 0; #check slave lag periodically + $totalMatchingRevisions = 0; + $masterPos = false; + for ( $pageId = $startId; $pageId <= $maxPageId; $pageId++ ) { + $pageRes = $dbr->select( 'page', array('page_id', 'page_namespace', 'page_title'), + $pageConds + array('page_id' => $pageId), $fname ); + if ( $dbr->numRows( $pageRes ) == 0 ) { + continue; + } + $pageRow = $dbr->fetchObject( $pageRes ); + + # Display progress + $titleObj = Title::makeTitle( $pageRow->page_namespace, $pageRow->page_title ); + print "$pageId\t" . $titleObj->getPrefixedDBkey() . " "; + + # Load revisions + $revRes = $dbw->select( $tables, $fields, + array( 'rev_page' => $pageRow->page_id ) + $conds, + $fname, + $revLoadOptions + ); + $revs = array(); + while ( $revRow = $dbw->fetchObject( $revRes ) ) { + $revs[] = $revRow; + } + + if ( count( $revs ) < 2) { + # No revisions matching, no further processing + print "\n"; + continue; + } + + # For each chunk + $i = 0; + while ( $i < count( $revs ) ) { + if ( $i < count( $revs ) - $maxChunkSize ) { + $thisChunkSize = $maxChunkSize; + } else { + $thisChunkSize = count( $revs ) - $i; + } + + $chunk = new ConcatenatedGzipHistoryBlob(); + $stubs = array(); + $dbw->begin(); + $usedChunk = false; + $primaryOldid = $revs[$i]->rev_text_id; + + # Get the text of each revision and add it to the object + for ( $j = 0; $j < $thisChunkSize && $chunk->isHappy( $maxChunkFactor, $factorThreshold ); $j++ ) { + $oldid = $revs[$i + $j]->rev_text_id; + + # Get text + if ( $loadStyle == LS_INDIVIDUAL ) { + $textRow = $dbw->selectRow( 'text', + array( 'old_flags', 'old_text' ), + array( 'old_id' => $oldid ), + $fname, + 'FOR UPDATE' + ); + $text = Revision::getRevisionText( $textRow ); + } else { + $text = Revision::getRevisionText( $revs[$i + $j] ); + } + + if ( $text === false ) { + print "\nError, unable to get text in old_id $oldid\n"; + #$dbw->delete( 'old', array( 'old_id' => $oldid ) ); + } + + if ( $j == 0 ) { + $chunk->setText( $text ); + print '.'; + } else { + # Don't make a stub if it's going to be longer than the article + # Stubs are typically about 100 bytes + if ( strlen( $text ) < 120 ) { + $stub = false; + print 'x'; + } else { + $stub = $chunk->addItem( $text ); + $stub->setLocation( $primaryOldid ); + $hash = $stub->getHash(); + $stub = serialize( $stub ); + print '.'; + $usedChunk = true; + } + $stubs[$j] = $stub; + } + } + $thisChunkSize = $j; + + # If we couldn't actually use any stubs because the pages were too small, do nothing + if ( $usedChunk ) { + # Store the main object + $dbw->update( 'text', + array( /* SET */ + 'old_text' => serialize( $chunk ), + 'old_flags' => 'object,utf-8', + ), array( /* WHERE */ + 'old_id' => $primaryOldid + ) + ); + + # Store the stub objects + for ( $j = 1; $j < $thisChunkSize; $j++ ) { + # Skip if not compressing + if ( $stubs[$j] !== false ) { + $dbw->update( 'text', + array( /* SET */ + 'old_text' => $stubs[$j], + 'old_flags' => 'object,utf-8', + ), array( /* WHERE */ + 'old_id' => $revs[$i + $j]->rev_text_id + ) + ); + } + } + } + # Done, next + print "/"; + $dbw->commit(); + $i += $thisChunkSize; + } + print "\n"; + } + return true; +} +?> |