if ( count( $args ) < 1 ) {
echo "Usage: php trackBlobs.php <cluster> [... <cluster>]\n";
echo "Adds blobs from a given ES cluster to the blob_tracking table\n";
+ echo "Automatically deletes the tracking table and starts from the start again when restarted.\n";
+
exit( 1 );
}
+$tracker = new TrackBlobs( $args );
+$tracker->run();
+echo "All done.\n";
-trackBlobs( $args );
+class TrackBlobs {
+ var $clusters, $textClause;
+ var $doBlobOrphans;
+ var $trackedBlobs = array();
-function trackBlobs( $clusters ) {
- initTrackingTable();
- trackRevisions( $clusters );
- trackOrphans( $clusters );
-}
+ var $batchSize = 1000;
+ var $reportingInterval = 10;
-function initTrackingTable() {
- $dbw = wfGetDB( DB_MASTER );
- if ( !$dbw->tableExists( 'blob_tracking' ) ) {
- $dbw->sourceFile( dirname( __FILE__ ) . '/blob_tracking.sql' );
+ function __construct( $clusters ) {
+ $this->clusters = $clusters;
+ if ( extension_loaded( 'gmp' ) ) {
+ $this->doBlobOrphans = true;
+ foreach ( $clusters as $cluster ) {
+ $this->trackedBlobs[$cluster] = gmp_init( 0 );
+ }
+ } else {
+ echo "Warning: the gmp extension is needed to find orphan blobs\n";
+ }
}
-}
-function getTextClause( $clusters ) {
- $dbr = wfGetDB( DB_SLAVE );
- $textClause = '';
- foreach ( $clusters as $cluster ) {
- if ( $textClause != '' ) {
- $textClause .= ' OR ';
+ function run() {
+ $this->initTrackingTable();
+ $this->trackRevisions();
+ $this->trackOrphanText();
+ if ( $this->doBlobOrphans ) {
+ $this->findOrphanBlobs();
}
- $textClause .= 'old_text LIKE ' . $dbr->addQuotes( $dbr->escapeLike( "DB://$cluster/" ) . '%' );
}
- return $textClause;
-}
-function interpretPointer( $text ) {
- if ( !preg_match( '!^DB://(\w+)/(\d+)(?:/([0-9a-fA-F]+)|)$!', $text, $m ) ) {
- return false;
+ function initTrackingTable() {
+ $dbw = wfGetDB( DB_MASTER );
+ if ( $dbw->tableExists( 'blob_tracking' ) ) {
+ $dbw->query( 'DROP TABLE ' . $dbw->tableName( 'blob_tracking' ) );
+ $dbw->query( 'DROP TABLE ' . $dbw->tableName( 'blob_orphans' ) );
+ }
+ $dbw->sourceFile( dirname( __FILE__ ) . '/blob_tracking.sql' );
}
- return array(
- 'cluster' => $m[1],
- 'id' => intval( $m[2] ),
- 'hash' => isset( $m[3] ) ? $m[2] : null
- );
-}
-/**
- * Scan the revision table for rows stored in the specified clusters
- */
-function trackRevisions( $clusters ) {
- $dbw = wfGetDB( DB_MASTER );
- $dbr = wfGetDB( DB_SLAVE );
- $batchSize = 10;
- $reportingInterval = 10;
-
- $textClause = getTextClause( $clusters );
- $startId = 0;
- $endId = $dbr->selectField( 'revision', 'MAX(rev_id)', false, __METHOD__ );
- $batchesDone = 0;
- $rowsInserted = 0;
-
- echo "Finding revisions...\n";
-
- while ( true ) {
- $res = $dbr->select( array( 'revision', 'text' ),
- array( 'rev_id', 'rev_page', 'old_id', 'old_flags', 'old_text' ),
- array(
- 'rev_id > ' . $dbr->addQuotes( $startId ),
- 'rev_text_id=old_id',
- $textClause,
- "old_flags LIKE '%external%'",
- ),
- __METHOD__,
- array(
- 'ORDER BY' => 'rev_id',
- 'LIMIT' => $batchSize
- )
- );
- if ( !$res->numRows() ) {
- break;
+ function getTextClause() {
+ if ( !$this->textClause ) {
+ $dbr = wfGetDB( DB_SLAVE );
+ $this->textClause = '';
+ foreach ( $this->clusters as $cluster ) {
+ if ( $this->textClause != '' ) {
+ $this->textClause .= ' OR ';
+ }
+ $this->textClause .= 'old_text' . $dbr->buildLike( "DB://$cluster/", $dbr->anyString() );
+ }
}
+ return $this->textClause;
+ }
- $insertBatch = array();
- foreach ( $res as $row ) {
- $startId = $row->rev_id;
- $info = interpretPointer( $row->old_text );
- if ( !$info ) {
- echo "Invalid DB:// URL in rev_id {$row->rev_id}\n";
- continue;
+ function interpretPointer( $text ) {
+ if ( !preg_match( '!^DB://(\w+)/(\d+)(?:/([0-9a-fA-F]+)|)$!', $text, $m ) ) {
+ return false;
+ }
+ return array(
+ 'cluster' => $m[1],
+ 'id' => intval( $m[2] ),
+ 'hash' => isset( $m[3] ) ? $m[2] : null
+ );
+ }
+
+ /**
+ * Scan the revision table for rows stored in the specified clusters
+ */
+ function trackRevisions() {
+ $dbw = wfGetDB( DB_MASTER );
+ $dbr = wfGetDB( DB_SLAVE );
+
+ $textClause = $this->getTextClause();
+ $startId = 0;
+ $endId = $dbr->selectField( 'revision', 'MAX(rev_id)', false, __METHOD__ );
+ $batchesDone = 0;
+ $rowsInserted = 0;
+
+ echo "Finding revisions...\n";
+
+ while ( true ) {
+ $res = $dbr->select( array( 'revision', 'text' ),
+ array( 'rev_id', 'rev_page', 'old_id', 'old_flags', 'old_text' ),
+ array(
+ 'rev_id > ' . $dbr->addQuotes( $startId ),
+ 'rev_text_id=old_id',
+ $textClause,
+ 'old_flags ' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ),
+ ),
+ __METHOD__,
+ array(
+ 'ORDER BY' => 'rev_id',
+ 'LIMIT' => $this->batchSize
+ )
+ );
+ if ( !$res->numRows() ) {
+ break;
}
- if ( !in_array( $info['cluster'], $clusters ) ) {
- echo "Invalid cluster returned in SQL query: {$info['cluster']}\n";
- continue;
+
+ $insertBatch = array();
+ foreach ( $res as $row ) {
+ $startId = $row->rev_id;
+ $info = $this->interpretPointer( $row->old_text );
+ if ( !$info ) {
+ echo "Invalid DB:// URL in rev_id {$row->rev_id}\n";
+ continue;
+ }
+ if ( !in_array( $info['cluster'], $this->clusters ) ) {
+ echo "Invalid cluster returned in SQL query: {$info['cluster']}\n";
+ continue;
+ }
+ $insertBatch[] = array(
+ 'bt_page' => $row->rev_page,
+ 'bt_rev_id' => $row->rev_id,
+ 'bt_text_id' => $row->old_id,
+ 'bt_cluster' => $info['cluster'],
+ 'bt_blob_id' => $info['id'],
+ 'bt_cgz_hash' => $info['hash']
+ );
+ if ( $this->doBlobOrphans ) {
+ gmp_setbit( $this->trackedBlobs[$info['cluster']], $info['id'] );
+ }
}
- $insertBatch[] = array(
- 'bt_page' => $row->rev_page,
- 'bt_rev_id' => $row->rev_id,
- 'bt_text_id' => $row->old_id,
- 'bt_cluster' => $info['cluster'],
- 'bt_blob_id' => $info['id'],
- 'bt_cgz_hash' => $info['hash']
- );
- }
- $dbw->insert( 'blob_tracking', $insertBatch, __METHOD__ );
- $rowsInserted += count( $insertBatch );
+ $dbw->insert( 'blob_tracking', $insertBatch, __METHOD__ );
+ $rowsInserted += count( $insertBatch );
- ++$batchesDone;
- if ( $batchesDone >= $reportingInterval ) {
- $batchesDone = 0;
- echo "$startId / $endId\n";
- wfWaitForSlaves( 5 );
+ ++$batchesDone;
+ if ( $batchesDone >= $this->reportingInterval ) {
+ $batchesDone = 0;
+ echo "$startId / $endId\n";
+ wfWaitForSlaves( 5 );
+ }
}
+ echo "Found $rowsInserted revisions\n";
}
- echo "Found $rowsInserted revisions\n";
-}
-/**
- * Scan the text table for orphan text
- */
-function trackOrphans( $clusters ) {
- # Wait until the blob_tracking table is available in the slave
- $dbw = wfGetDB( DB_MASTER );
- $dbr = wfGetDB( DB_SLAVE );
- $pos = $dbw->getMasterPos();
- $dbr->masterPosWait( $pos, 100000 );
-
- $batchSize = 10;
- $reportingInterval = 10;
-
- $textClause = getTextClause( $clusters );
- $startId = 0;
- $endId = $dbr->selectField( 'text', 'MAX(old_id)', false, __METHOD__ );
- $rowsInserted = 0;
- $batchesDone = 0;
-
- echo "Finding orphan text...\n";
-
- # Scan the text table for orphan text
- while ( true ) {
- $res = $dbr->select( array( 'text', 'blob_tracking' ),
- array( 'old_id', 'old_flags', 'old_text' ),
- array(
- 'old_id>' . $dbr->addQuotes( $startId ),
- $textClause,
- "old_flags LIKE '%external%'",
- 'bt_text_id IS NULL'
- ),
- __METHOD__,
- array(
- 'ORDER BY' => 'old_id',
- 'LIMIT' => $batchSize
- ),
- array( 'blob_tracking' => array( 'LEFT JOIN', 'bt_text_id=old_id' ) )
- );
- $ids = array();
- foreach ( $res as $row ) {
- $ids[] = $row->old_id;
+ /**
+ * Scan the text table for orphan text
+ * Orphan text here does not imply DB corruption -- deleted text tracked by the
+ * archive table counts as orphan for our purposes.
+ */
+ function trackOrphanText() {
+ # Wait until the blob_tracking table is available in the slave
+ $dbw = wfGetDB( DB_MASTER );
+ $dbr = wfGetDB( DB_SLAVE );
+ $pos = $dbw->getMasterPos();
+ $dbr->masterPosWait( $pos, 100000 );
+
+ $textClause = $this->getTextClause( $this->clusters );
+ $startId = 0;
+ $endId = $dbr->selectField( 'text', 'MAX(old_id)', false, __METHOD__ );
+ $rowsInserted = 0;
+ $batchesDone = 0;
+
+ echo "Finding orphan text...\n";
+
+ # Scan the text table for orphan text
+ while ( true ) {
+ $res = $dbr->select( array( 'text', 'blob_tracking' ),
+ array( 'old_id', 'old_flags', 'old_text' ),
+ array(
+ 'old_id>' . $dbr->addQuotes( $startId ),
+ $textClause,
+ 'old_flags ' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ),
+ 'bt_text_id IS NULL'
+ ),
+ __METHOD__,
+ array(
+ 'ORDER BY' => 'old_id',
+ 'LIMIT' => $this->batchSize
+ ),
+ array( 'blob_tracking' => array( 'LEFT JOIN', 'bt_text_id=old_id' ) )
+ );
+ $ids = array();
+ foreach ( $res as $row ) {
+ $ids[] = $row->old_id;
+ }
+
+ if ( !$res->numRows() ) {
+ break;
+ }
+
+ $insertBatch = array();
+ foreach ( $res as $row ) {
+ $startId = $row->old_id;
+ $info = $this->interpretPointer( $row->old_text );
+ if ( !$info ) {
+ echo "Invalid DB:// URL in old_id {$row->old_id}\n";
+ continue;
+ }
+ if ( !in_array( $info['cluster'], $this->clusters ) ) {
+ echo "Invalid cluster returned in SQL query\n";
+ continue;
+ }
+
+ $insertBatch[] = array(
+ 'bt_page' => 0,
+ 'bt_rev_id' => 0,
+ 'bt_text_id' => $row->old_id,
+ 'bt_cluster' => $info['cluster'],
+ 'bt_blob_id' => $info['id'],
+ 'bt_cgz_hash' => $info['hash']
+ );
+ if ( $this->doBlobOrphans ) {
+ gmp_setbit( $this->trackedBlobs[$info['cluster']], $info['id'] );
+ }
+ }
+ $dbw->insert( 'blob_tracking', $insertBatch, __METHOD__ );
+
+ $rowsInserted += count( $insertBatch );
+ ++$batchesDone;
+ if ( $batchesDone >= $this->reportingInterval ) {
+ $batchesDone = 0;
+ echo "$startId / $endId\n";
+ wfWaitForSlaves( 5 );
+ }
}
+ echo "Found $rowsInserted orphan text rows\n";
+ }
- if ( !$res->numRows() ) {
- break;
+ /**
+ * Scan the blobs table for rows not registered in blob_tracking (and thus not
+ * registered in the text table).
+ *
+ * Orphan blobs are indicative of DB corruption. They are inaccessible and
+ * should probably be deleted.
+ */
+ function findOrphanBlobs() {
+ if ( !extension_loaded( 'gmp' ) ) {
+ echo "Can't find orphan blobs, need bitfield support provided by GMP.\n";
+ return;
}
- $insertBatch = array();
- foreach ( $res as $row ) {
- $startId = $row->old_id;
- $info = interpretPointer( $row->old_text );
- if ( !$info ) {
- echo "Invalid DB:// URL in old_id {$row->old_id}\n";
+ $dbw = wfGetDB( DB_MASTER );
+
+ foreach ( $this->clusters as $cluster ) {
+ echo "Searching for orphan blobs in $cluster...\n";
+ $lb = wfGetLBFactory()->getExternalLB( $cluster );
+ try {
+ $extDB = $lb->getConnection( DB_SLAVE );
+ } catch ( DBConnectionError $e ) {
+ if ( strpos( $e->error, 'Unknown database' ) !== false ) {
+ echo "No database on $cluster\n";
+ } else {
+ echo "Error on $cluster: " . $e->getMessage() . "\n";
+ }
continue;
}
- if ( !in_array( $info['cluster'], $clusters ) ) {
- echo "Invalid cluster returned in SQL query\n";
+ $table = $extDB->getLBInfo( 'blobs table' );
+ if ( is_null( $table ) ) {
+ $table = 'blobs';
+ }
+ if ( !$extDB->tableExists( $table ) ) {
+ echo "No blobs table on cluster $cluster\n";
continue;
}
+ $startId = 0;
+ $batchesDone = 0;
+ $actualBlobs = gmp_init( 0 );
+ $endId = $extDB->selectField( $table, 'MAX(blob_id)', false, __METHOD__ );
- $insertBatch[] = array(
- 'bt_page' => 0,
- 'bt_rev_id' => 0,
- 'bt_text_id' => $row->old_id,
- 'bt_cluster' => $info['cluster'],
- 'bt_blob_id' => $info['id'],
- 'bt_cgz_hash' => $info['hash']
- );
- }
- $dbw->insert( 'blob_tracking', $insertBatch, __METHOD__ );
+ // Build a bitmap of actual blob rows
+ while ( true ) {
+ $res = $extDB->select( $table,
+ array( 'blob_id' ),
+ array( 'blob_id > ' . $extDB->addQuotes( $startId ) ),
+ __METHOD__,
+ array( 'LIMIT' => $this->batchSize, 'ORDER BY' => 'blob_id' )
+ );
- $rowsInserted += count( $insertBatch );
- ++$batchesDone;
- if ( $batchesDone >= $reportingInterval ) {
- $batchesDone = 0;
- echo "$startId / $endId\n";
- wfWaitForSlaves( 5 );
+ if ( !$res->numRows() ) {
+ break;
+ }
+
+ foreach ( $res as $row ) {
+ gmp_setbit( $actualBlobs, $row->blob_id );
+ }
+ $startId = $row->blob_id;
+
+ ++$batchesDone;
+ if ( $batchesDone >= $this->reportingInterval ) {
+ $batchesDone = 0;
+ echo "$startId / $endId\n";
+ }
+ }
+
+ // Find actual blobs that weren't tracked by the previous passes
+ // This is a set-theoretic difference A \ B, or in bitwise terms, A & ~B
+ $orphans = gmp_and( $actualBlobs, gmp_com( $this->trackedBlobs[$cluster] ) );
+
+ // Traverse the orphan list
+ $insertBatch = array();
+ $id = 0;
+ $numOrphans = 0;
+ while ( true ) {
+ $id = gmp_scan1( $orphans, $id );
+ if ( $id == -1 ) {
+ break;
+ }
+ $insertBatch[] = array(
+ 'bo_cluster' => $cluster,
+ 'bo_blob_id' => $id
+ );
+ if ( count( $insertBatch ) > $this->batchSize ) {
+ $dbw->insert( 'blob_orphans', $insertBatch, __METHOD__ );
+ $insertBatch = array();
+ }
+
+ ++$id;
+ ++$numOrphans;
+ }
+ if ( $insertBatch ) {
+ $dbw->insert( 'blob_orphans', $insertBatch, __METHOD__ );
+ }
+ echo "Found $numOrphans orphan(s) in $cluster\n";
}
}
- echo "Found $rowsInserted orphan text rows\n";
}
dépôts / lhc / web / wiklou.git / blobdiff